Ive been dealing with this $*** for a month now... and Ive had it.

Mods: whipple 3.0 pulley, 60's, K&N, MAFia, BAP, Accufab, o/r xpipe, flowmasters.

Car ran solid for a month with that setup. One morning I started the car and noticed the hesitation when starting off in first gear. Problem gradually progressed to constant hesitation, power loss, stumbleing.

Problem:

o2's are pegged(.98ish) at idle, fuel trims are pegged at -25% trying to pull out fuel. ALL plugs are black, car hesitates at any rpm, stumbles under boost. Lacks ALL power.


Checked so far:

MAF's were switched
new tune was written without MAFia
EGR system was removed
No vac leaks
TPS is set at .99
IAC was removed/cleaned
FRPS was replaced
No misfires
Brand new PCM was installed
FPDM was swapped with a working unit
Plugs were replaced, now they are black
Fuel filter was changed
switched tunes

Fuel rail pressure is normal
ECT is normal
IAT's are normal
TPS is normal
VAC is normal


I dont know what else could cause my car to run like this. The problem went from random, meaning it would hesitate, then 20min later run perfectly fine, to constantly like this.