RB20DET problem *WRX sound*

[Roy]

Dont worry if its coming and going then it wont last 3 months..it will soon give up the ghost all together.

Best bet is keep the cover off and keep a multimeter in the car. When it happns next pull the coil packs off and check the resistances...it will soon point to the offendign coil pack. Justr be carful the little buggers are hot:)

[CerealKiller]

I had a very random misfire. Some days it'll work perfect, others it'll go into boxer mode. This happened very randomly, no set amount of boost or revs could get it to trigger. I had UAS and Grey Imports both look at my coils but they both reported them to be fine. I finally got it to misfire when I had the car at Grey Imports. Coil pack #1 was the culprit. Replaced that and all is good now, but I'm saving up for some Spitfires now.

[Mr GTS4]

i had a problem like it and i turned out to be the injectors dying