Any thought on what my cars doing?

[300hpbound]

I've searched this issue for literally the past 3 months and nothing. This is the first video I could get of it and its relatively crappy. This is on the softer side too, there have been times were it drops down to 400-300 rpm. this is what happens:

YouTube - VID 00001-20100601-1955.3GP

All I do is come to a stop. Not a heavy stop or anything and it starts chugging like it's gonna die. The lights dim and it acts like it's missing but I literally check the spark plugs every time I do an oil change (every 2500-3000 miles) and every time they come out looking great. the wires I'm running are the Nology hotwires and they have been great to me. this problem started before the new wires as well. In the video it looks very unison but this happens very randomly, sometimes it'll level off at a nice idle and then just start "missing" again. As soon as I step on the gas again it runs perfect. I was told at one point to check the vacuum hoses and everything has been replaced by me within the last 10,000 miles or so so there are no issues with them. Any thoughts?

P.S. timing is on

 

[kenuwine4g63]

yea man check those vac hoses and or remove them and cap them off. what mods do you have?

 

[300hpbound]

nothing really just a cold air intake and Nology hotwires. Other than that I have some break mods but those would have nothing to do with this. I need to pick up and egr block off if I cap the hoses (if I do it right anyway) And since its a non turbo I don't have to leave any vacuum hoses on so that'll be nice

 

[delta448]

First of all, why would you leave the stereo broadcasting to the whole neighborhood if you were recording a video for us to help you? We can't hear shit about what's going on with the engine at all and you already should know your system is going to sound really distorted on a video. A good description of the problem would've been just fine.

Now, turn off any extra electrical load, the AC, the system, the foglights, etc., don't turn the steering wheel (causing the PS pump to run), and see if it's still stumbling at idle. Yes? okay, now put the shifter in P (or N and set e-brake) and pop the hood (I'm guessing this is an auto?). Raise idle rpm a little, verify the O2 sensor is cycling between 0.2-0.8 volts and look into getting the tranny fluid changed, you may also have a dieing torque convertor.

A small dip is somewhat normal when coming to a stop really quickly, it can take a split second for the ECU to readjust from no IPW during deceleration to idling, but if it continues to stutter and bounce the problem is either a bad O2 sensor signal, a bad MAS signal, an out-of-adjustment BISS, a vacuum leak, a fuel restriction, or any combination or sub-problem involving any of these.

 

[TSITurbo95]

Kind of off topic, but what song is that? Also, you have a sub correct? Try not using the sub to see if it still does that. As it seems to drop when the sub hits.

 

[Asian Beast]

I have run into similar problems that causes these surges.. the easiest check is to remove the intake inlet to the throttle body and clean the throttle plate.. excessive carbon build up can cause the idle to surge and if the build up is bad enough will cause stalling. Try this first and let us know

 

[300hpbound]

First of all, why would you leave the stereo broadcasting to the whole neighborhood if you were recording a video for us to help you? We can't hear shit about what's going on with the engine at all and you already should know your system is going to sound really distorted on a video. A good description of the problem would've been just fine.

Now, turn off any extra electrical load, the AC, the system, the foglights, etc., don't turn the steering wheel (causing the PS pump to run), and see if it's still stumbling at idle. Yes? okay, now put the shifter in P (or N and set e-brake) and pop the hood (I'm guessing this is an auto?). Raise idle rpm a little, verify the O2 sensor is cycling between 0.2-0.8 volts and look into getting the tranny fluid changed, you may also have a dieing torque convertor.

A small dip is somewhat normal when coming to a stop really quickly, it can take a split second for the ECU to readjust from no IPW during deceleration to idling, but if it continues to stutter and bounce the problem is either a bad O2 sensor signal, a bad MAS signal, an out-of-adjustment BISS, a vacuum leak, a fuel restriction, or any combination or sub-problem involving any of these.

number one as I said this is the first time i've actually been able to get a video of it so sorry for turning my stereo down not being the first thing that crosses my mind. literally 90% of the time I'd pull my phone out to record it wold stop doing it and idle perfectly fine.

At the time the video was taken, only the stereo and the lights were on but this happens during the day as well. I've driven with my stereo off completely, it'll still do it sometimes. Like I said, this isn't something that happens all the time, just randomly. And also, I told ya that I didn't come to a stop really quickly, I drive my car like a grandma half the time so breaking happens over a period, not within the last 30 ft before the light. I can understand what your saying though and i'll check all of the above so please don't take this as an argument starter.

TSI- the song was "tell me" by story of the year