Why wont it run!?

[Thatoneguy]

I have a 89 pathfinder SE. One day while driving it lost power for a quick second almost like a hiccup, once i came off the gas it would not accelerate and when it would, it would putt, almost like a machine gun, ive changed MAF, TPS, O2 sensor, engine coolant temp sensor, and its worse, now it idles like an old truck as if it wants to die, when i got it last year i changed, fuel filter, spark plugs, air filter. When i drive now its like a rodeo, it stops and goes, stops and goes but when it goes its a hard kick. Any idea?

[adamzan]

Check the timing?

[Thatoneguy]

It seems like me and Leo94 have the exact same issue with fuel in oil and smoke when it runs and all that, going to try a few things then go ahead and check timing, thanks for the reply!

[Thatoneguy]

http://www.nissanpathfinders.net/forum/topic/33854-rough-idle-missfire-and-smoke/?p=636237

[Slartibartfast]

Fuel in oil and smoke when it runs sounds like a leaky injector to me. Or the ECU is richening the mixture to absurd lengths. I don't know the TBI as well but I'd start by doing the ECU self-test on the oxygen sensor and checking the temp sensor to see if it's in spec.