What causes misfiring because my car is doing it a lot. I currently have KS code and front right 02 sensor code. It only happens at really low rpm's when i'm pulling away from a stop sign or when the light turns green.

Just replaced sparkplugs and it didn't really help. I have an exhaust leak. could that be it? Any suggestions would be appreciated.

I don't want to put any real money into this car. Thanks

 

Coils......And, you should be getting a misfire code, if you are actually misfiring.

 

first thing is fix your codes and then go from there.

If you don't want to put money into the car, sell it and buy a car that has a warranty. You'll just end up with more problems down the road if you don't keep up on maintence

 

bro check the fuel injectors.. i had the same problem when i put new ones in.. they didnt come with the plastic pintle cap that goes on top of the injectors.. they gave me nasty missfires.. also check the o rings they can leak..

 

i bet money its either the KS or some kind of bad connection ( get your codes fix asap)

this MAY help:
http://forums.maxima.org/showthread.php?t=473170

 

The knock sensor will not cause the car to run like that, it will just be down on power with a dead knock sensor. Fix the exhaust and O2 and then go from there if there are still problems

 

Well, merlins said i have a leaking intake manifold (whatever that is). Could that be causing this horrible, popping, hesitation?

 

I had the same thing, #2 cylinder coil pack, my ECU indicated it tho, so easy fix, clear the OS code 1st, KS is probably due to the misfire, had it with mine as well.

 

Dude its probably your coil pack things. at night park your car somewhere that has NO light.. no lamps or anything you want it really dark. Let your car idle and look at the spark plug connectors/coil packs and see if you see sparks. If you do its the coil packs for sure.