Ok, all jokes aside, as I've heard them all...
I have a pretty random breaking up issue. It happens around 4000rpm up... Somedays its ok, somedays its absolutely horrible. Sometimes its fine and then bad in the same day. Other than this, the car runs great. It idles great; it cruises great... coolant temp stays perfect.. all fluids look good, ect.
Did change out the plugs today. Haven't driven the car yet, though.
What was odd is that when the car was given timing and fuel, it had a pretty nice, clean pull... but it was registering knock. So then we took fuel back out to lean it out, but it then broke up in all gears... I couldn't even get it to rev out to 5000rpm because it was breaking up so bad. This doesn't make sense to me at all! You'd think running rich would cause problems like this. Well, it's still running rich... but you know.
As for what's done to the car:
- Forced Performance 2 272/272 cams with upgraded springs/retainers
- Cleaned up Cly head with mild port/polish job; it was cut down due to being warped
-Cometic MLS HG (thicker than stock to make up for the undercut head)
-Evo3 16g turbo
-ETS street FMIC/Tial BOV/3"GM MAF (blow-through)
-650cc injectors
-Walboro 255 rewire pump and Aeromotive FPR set to 43psi base
-3" turbo-back thermal RD exhaust
-Megan 02 housing
-EVO3 exhaust manifold
-DSMlink V3 with the GM MAF cable
-AEM WB
-ARP head studs and ARP rod bolts
-JE Forged pistons 8.5:1
-currently running 25psi boost
I think that's most of it off hand...
Attached is a pic of the plugs...
Thank you for any advise... I'm confused. :/