mine did that for a while to , i just used to keep on buying new plugs , so i got tired of it and bought a new ignition system(2 new coils,set of good wires , and ngk iriduim plugs) and hasn't came back at all , and its been like 10,000 miles ago

 

well, ive replaced all of that several times over and it has never helped.

just replaced the coil packs yesterday and guess what.............................................. .................................................. .....................................still does it.

im at a loss. may have a lead though. was reading about what a bad throttle position sensor will do and it sounds similar. so i unplugged the TPS and car drove exactly the same which leads me to believe that could be the problem. luckily i have an extra one

 

Let me know if that works - I'll go ahead and replace that too... lol

 

Hrmm, what about a clogged injector?

 

well, i replaced the TPS and lowered the fuel pressure slightly and it now only does it from 3700-4200 RPM at full throttle. it seems to do it less and less the lower my fuel pressure is, so now im starting to think its fuel related (on my vehicle anyway). i will put the stock fuel rail and FPR back on this week to see if it changes anything.

 

I am throwing in some of that Techron fuel injector cleaner - I'll let you know how that turns out...

 

just use seafoam. much better.

 

do our cars have a lot of problems with cylinder 2 or what cause mine also was hessitating. Changed the spark plugs, and bought some magstar racing wires *lol* and it went away o.O.

 

i believe they do. im hearing more and more about it.

 

my car has been doing great , just needed to get a tune up when i bought it, and it hasn't had the cel light on for more than 18k miles

 

Seems to be working quite well right now....

 

and now not so much....
I've ran 2 bottles of Techron cleaner through there... and it's still doing it...

It seems it would clear up for a bit but now it's worse - happens when the car runs for long periods of time as well.

It will stat to shake pretty rough and not move anywhere - still sounds like a misfire to me. I need to replace all the coil packs and possibly the TPS?

ANy other ideas?

Thanks

 

have you cleaned you MAF?

 

Should be on the intake pipe correct? i have not cleaned it...

 

its probably gonna b the coils