SuthernFlames316

My heap is running like crap. On cold starts, my rpms hit around 1000, when put under load (Reverse, Drive) they drop to about 300 and wants to die. When i start to drive, the engine sputters like I press the throttle and it hesitates and does not want to go forward. Kinda hard to explain on the net.

I replaced the fuel filter, figuring it was the problem. It doesnt seem like it
I brought my truck to autozone to get scanned. It has p0102 (MAF/VAF low circuit, and p0174 (Engine too lean, bank 2 oxygen sensor). So i bought some MAF electrical cleaner, cleaned the MAF really good, cleaned the the throttle body as well. It still acts up.

Ive been fighting this **** for 2 weeks now. Please help haha. I dont know what else to look for besides the MAF, IAC, Plugs, Vacuum, or Clogged Cat.

Hemi Killer

iTrader: (6)

what year, mods, etc.?

SuthernFlames316

i new i was forgetting something.

99 NBS GMC 5.3. Just a K&N intake.

budhayes3

iTrader: (19)

The MAF may be poop beyond the point that cleaning it will fix, I've seen them cause lean codes as well, usually P0171 though. It is possible that you have a bad O2 sensor too, but I'd go after the MAF first, clear the codes, and take it from there. Check for air intake leaks and exhaust leaks also, as they will give the sensors incorrect readings.