Something is wrong, can't pinpoint it.....
Ok I'm stumped. Recently I did the kegger mod and fixed the plenum. It was really bad, completely blown out in two spots and consumed about 2 quarts in 500mi. Now I know I need a new IAC but it feels like the timing is off when the peddle it all the way down. It has a noticeable miss-fire when accelerating at 1/8-1/4 throttle in 4th gear and I have lost 10mph in the 1/4 mile (embarrassing cause my buddies tuned blazer can now keep up). It shutters between 2500-3000rpm at WOT and just won't go past 3000+ rpm (those with 5.9's now the awesome power in this range). The exhaust smells rich, possibilities I have thought of:
1) Fouled Plugs (will be checking these on thursday)
2) Original coil could be going bad
3) O2 sensor (original, truck has 168k now and all that oil burned recently)
4) Cam sensor
And of course NO CODES!!!!!!!!! Typical eh? I need this truck in tip top shape cause I feel guilty otherwise, all help and suggestions appreciated.