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Hello
My 94 Supra sputters and sometimes backfires when i boost in second gear. Sometimes in first as well. Sometimes it does and sometimes it doesnt. If iam at stock boost its fine. But once i crank it up a lil bit it does it again. It never did this before when i used to boost 20psi. It started recently. I had NGK 3330 but i changed them and it still does. I have the HKS EVC IV controller. What could be the problem? Thanks
 

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I know u said u changed your plug.... there new but double check them... I had a set of brand new one that was faulty on me... screwed me out of a night of racing cuz it was like fuel cut.... and also check your coil pack make sure there still good under high boost.... good luck....
 
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