high revs misfire and backfiring.

**ChezoGTR** · 09-15-2011, 08:46 PM

okay i stole this thread from another GTR site but i wanna start it here cuz i had this issue and it drove me up the wall and i think this will help the noobs

**cnruff** · 09-16-2011, 11:08 PM

i had the same issue as you, what i did was

1. clean my mafs
2. check my tps .44v
3. clean my aac
4. change spark plugs
5. change coil parks (before i change my coil packs i am still having misfiring issue but not as bad after i did the 4 step then when i change the coils it even runs better now)

**ChezoGTR** · 09-19-2011, 02:03 AM

yeah im still running rich but at least im burning the fuel now and not backfiring as much. im wondering if i have a pooched o2 sensor

**Rides** · 09-20-2011, 06:32 PM

i'm not sure if i'm having this same problem, but i do need help as i'm spending so much money trying to fix this. Basically, my problem started by stalling at rolling stops, as i down shift it'll back fire, then when i stop it'll stall. it doesn't do it all the time, but i does happen, and when it does, my car begins to bunny hop down the damn road. it'll lose all power underload making want to stall as i'm driving. So...after taking it to a mechanic, i had another set of mafs installed as we thought this was the original problem (cleaned too) . Changed the ignitor, clean aac...and now, it doesn't stall at the lights or rolling stop, but i'll still want to lose power underload. This will happen if i just down shift and backfires. Please someone help me, i don't want to spend useless money and just want to spend the money where the problem is at.

**ChezoGTR** · 09-20-2011, 09:26 PM

check everything ive related to the problem plugs coil packs your cam angle sensor the big round thing on the front of your timing cover o2 sensors. make sure your plugs are at least a 6 heat rang and that they are gaped to 0.8mm and your timing should be at 20 degrees on the timing marks at idel