i have a studder at full throttle...

[audithisworld]

kinda feels like a misfire or a coilpack but i think the coilpack woulda blown by now.could it be a boost leak?

[bob12312357]

pull the codes, sometimes no CEL but it'll still throw a code. Try cleaning the MAF, if that isn't it try swapping around coilpacks and see if the code follows any coil pack.

[Seerlah]

I say it is a bad ignition coil. If you have a VAG com, you can scan your car to oull intermittent codes. It will tell you which cylinder is misfiring. Swap a coil from the cylinder that is misfiring with one that is not. Go for another WOT run. If the misfire moves to the cylinder which the suspected bad coil was from, then it is the ignition coil. Very common issue.

[Tifun]

Sounds a lot like what just went through. Mine was a coil pack that has been slowly shorting out.

[audithisworld]

yea i remember having this problem before but by now i would have a CEL and more often misfiring

[offroader1006]

coil should misfire under light load, spark plugs will misfire under heavy load only.

[Tifun]

coil should misfire under light load, spark plugs will misfire under heavy load only.

I disagree. Mine mainly did it under heavy load, would randomly do it at idle and the CEL only came on twice. Once I cleared it, the light stayed off unless I throttled it hard. Checked plugs and they were fine. Dropped in a new coilpack today actually and it runs like a champ with no misfires or odd studders.

[offroader1006]

depends on what you consider heavy load.


mine would accelerate perfect not in boost, misife at first hint of boost with the bad coil.

the plugs only misfire above 15psi

[Tifun]

I didn't have misfire til about 17psi. Every situation is different I suppose. But like you it would be somewhat fine until in boost, especially heavy. It was semi consistent and would sometimes miss at lower boost levels.