The car normally runs up to about .7/.8 bar but recently anything above 0.5 causes the car to judder when accelerating, like I'm lifting my foot on and off the throttle slightly - the boost goes up and down a bit but I get no DV noise. It only seems to do this when warm however, when it's nice and hot she pulls cleanly all the way to the redline at 0.8ish bar.

On a cold start she the revs do tend to drop off to almost stall sometimes but after a few mintues she's fine again.

I'm wondering if the sparks are the wrong temp and aren't igniting the mix when warm causing it to miss or if I should look elsewhere.

Any ideas anyone?

 

MY?

 

sorry, it's a 96 STi 2 Type RA