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Fuel Trims, O2 Sensor, Vacuum, Idle- Jacked!

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Apeximprt2nr

15+ Year Contributor
620
5
Apr 20, 2005
Northern, New Jersey
Alright so, my car has been acting really weird the last week or so.

First off, this does NOT happen all the time, randomly and it will go on and off.

The car will idle fine, vacuum at idle is ~18 or so, rev up fine, etc.

Then randomly, but it's been happenign more often than not, the car will idle like I have cams, brap brap brap, vacuum will be shaking at -15, -10, when I rev it up in neutral it won't rev up as much (I have to give it a lot of gas to rev up). My O2 won't cycle and my fuel trims will be at +17, stuck there.

So I go to drive and the car will bounce around 15.5-16.0 : 1 while cruising, fuel trims still stuck at 17 and O2 won't cycle. Car will feel like a huge boost leak. If I press the clutch in it will either drop to 200 RPM's or die.
What's also weird, while this is happening if I go WOT the car will haul ass like no other, but while WOT'ing it will kinda miss, it won't be a smooth pull. i.e It's like that "extra" power will come on and off.

Then randomly while driving the car will go back to normal, O2 sensor will cycle, fuel trims damn near 0 idle is fine and vacuum is ~18, car won't die when I put the clutch in or drop RPM's, revving up is normal.

It's random. Car can be cold or warm.


What the hell is going on?!
 
I questioned it, but if it was dieing it would stay not cycling, not go back to normal. Also, I don't think that would make my vacuum so low. Though it's possible, if my O2 is not cycling, then my trims would be stuck, and I would run lean, which would cause the lopey idle and in turn make my vacuum low.

IDK, it's possible I guess. Any other ideas?
 
when was the last time you did regular mataince? I had a stalling problem and started with the small stuff and when I can came to cleaning the air filter my problem disapered. Now I am not saying this gonna sovle your problems but hey you never know
 
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