If i am in fourth or fifth gear, cruising about 2500 rpm, and i quickly apply about 50% throttle, i get minor hesitation and a slight shudder? Any ideas?

Not nearly as bad if i go to 100% throttle.
Knock sensor?
I seem to remember something about a PCV valve?

I am turboed.

 

Was this before and after your plug change? What are the new plugs gapped to?

 

Clogged Fuel Filter
Dirty Throttle Body
TPS Sensor
Coil Pack/Misfire
PCV

When was your last major service?

 

TPS?

 

i dont think it is a tps because my safc displays the throttle position voltage from the TPS and it seems to be accurate

 

OK so take the TPS out of the list...

 

Could be the recent change to cold plugs.

 

will a coilpack throw a code?
I have 6 extra ones, but i dont really feel like changing them all, any way to test them?

Could be fuel filter, could be throttle body or PCV.

 

Yeah, typically '0201 - Ignition Circut'.

 

When was your last major service?

When I did my first major service at 60K I was very suprised at how clogged my fuel filter was. The filter was spewing muddy clay like crud from the inlet side after I took it out. A lot of it!!!

When you step on the gas the engine is going to need a surge of fuel to compensate for the sudden opening of the throttle plate. Sort of like the accellerator pump on a carburator. (I'm dating myself again) If your fuel system doesn't have enough fuel pressure or volume to compensate for that, your going to get some kind of hesitation when you suddenly open up the throttle because of a lack of fuel.

So when was your last major service and what was replaced?

 

fuel filter was replaced in may of 02.
not an air filter, because I put on a new one w/ turbo.