Weird stuttering problem!

[slo-rst-laser]

Hey guys/girls, I have the weirdest problem. My car has just started to stutter on me again, it does it at all times, cold, hot, part throttle, full throttle, idle. I checked for a boost leak but that was not it. I have new plugs and wires so I eliminated that, It has done it before but for some reason it has stopped for about a month or two and now its doing it again. I found out that it is a little better at full boost but it still does it slightly. When it does it my car back fires and it stutters for a few seconds then stops, then does it agian a few seconds later, when I throttle it, it revs up like a two stroke. When it does it at idle my car bogs down really low and jumps back up. I really hope someone can help me out, I've tried 2 shops and a few guys that have pretty good knowledge about cars and none of them can figure it out. I'd appreciate it .

 

[Mr PopUps]

Water in the gas?

 

[Fast-Orange]

sounds like an ignition or timing problem your backfiring b/c the fuel isnt being ignited get a spark tester and make sure your coil is putting out proper voltage ahould be atleast 27kv i beleive

 

[slo-rst-laser]

I dont believe there is anywater in the gas, and i'll do the spark test tomorrow morning. Thanks for the responses guys!

 

[dsmfa9nutter]

Vacuum leak or your cts died and you're running very rich. Check your plugs, they should be a nice gray/tan color. Check engine light on? Does your idle hunt (rev up and then drop, repeat)?.

 

[slo-rst-laser]

The CEL has been on ever since I got the car. My idle does hunt, but it does it for only a little awhile, then runs normal, then does it agian. CTS? What does that stand for?

 

[dsmfa9nutter]

Coolant temp sensor. You should get a logger setup, you'll be able to read the codes and fix the problems without having to scratch your head.

 

[slo-rst-laser]

Alright I got the codes and this is what came up, tps, barometric pressure sensor, and knock sensor.

 

[dsmfa9nutter]

Check your tps (it's on the throttlebody), your maf, and the knock sensor (back of block, about 8 inches down from the intake, can't miss it. If the goo is leaking out of it, it needs to be replaced).

 

[slo-rst-laser]

One quick question, my closed throttle possition switch is on top of the TB instead in my ISC, what other cars can I yank it off of?