So heres my problem. This started happening out of no where. So Im driving my car and I felt like passing this car on the road. So as I came flying down past him or her my car at about 4 to 5 thousand Rpm backed off hard like a fuel cut would act. Its like loud pops and the Rpm wont climb until I let off. I was thinking at first maybe my coils are going bad and there cutting out. So I changed them and the problem is still there. So then I thought it must be fuel then, I changed my fuel filter and the problem is still there. I also took out the Vortech 12:1 FMU thinking maybe its bad. But the problem is still there. I hope my fuel pump is not giving out. Oh yea and this problem only happens in boost. If I lightly step on the gas and stay out of boost and let the RPM climb It will go all the way up there. I took out my spark plugs and there showing white (which is lean i guess).





Heres my set up:

Greddy intercooled @ 6 psi
2.5 from the test pipe back
305cc with Vortech FMU

 

I had a similar problem, it ended up being the spark plugs.

 

pop is usually backfires. so either its super rich or the spark is cutting out. what size gap on the plugs?

 

Spark!

 

I think I figured it out. I pulled my plugs and found them really white. So I hook up a Fuel pressure gauge at the pump right where the tank is at, and it read 40 psi (book says 65 to 85 psi). So I figured that my pump is just giving out. I ordered a walbro 190 last night. I hope that will fix it.

 

I left them alone. They were NGK V-power. I just bought BKR7E.