What's wrong?

[desertspyder]

Don't know what it could be. For the past couple of days my car has been stumbling or hesitating when I first press the gas pedal. Well today I was taking off from a stop and I got the hesitation followed by a few seconds of nothing after I pressed the gas pedal down more. After it stopped it drove fine. Has anyone else had this problem?

 

[IHeartTurbo]

How long has it been since you changed the plugs and wires? Get some NGK BPR6ES's, gap to .028", and some new wires.

 

[Rubberman2003]

I would agree, sounds like you might need a tune up, and might have a vacuum/boost leak.

 

[EclipseTrbo420A]

How long has it been since you changed the plugs and wires? Get some NGK BPR6ES's, gap to .028", and some new wires.

Good Post, and the one about the boost leak as well....also check the fuel filter thats a good place to start.

 

[desertspyder]

Have Bosch wires and Denso iridiums gapped (carefully) to .028 with about 400 miles on them. I pulled them and they look fine. My type S is pulling some serious vacuum from the lower nipple though. It's so loud that you can hear it before you even pop the hood.

 

[robs90tsi]

The same thing happened to me, change your plugs and wires, that should solve your problem.

 

[robs90tsi]

Have Bosch wires and Denso iridiums gapped (carefully) to .028 with about 400 miles on them. I pulled them and they look fine. My type S is pulling some serious vacuum from the lower nipple though. It's so loud that you can hear it before you even pop the hood.

Oh, didnt read that, change your plugs to NGK's anyway, theyre the best for the 4G63, and if I'm not mistaken, shouldnt there be a vacuum line from the BOV to the intake manifold, tell me you ldidnt leave that alone, take a look at this vacuum diagram, this should help.
http://www.dsmtuners.com/forums/showthread.php?t=198327