96 2.3 stumble on acceleration

[branflakes613]

I have a 96 2.3 auto with about 200,000 miles on it. Last week I did a timing belt, crank seals, cleaned the crank sensor (oil leak), spark plugs and coils (I removed the intake and throttle and cleaned both. I also cleaned the maf sensor. Since then I have had more problems. It is now having this weird stumble when I start to accelerate. If I barely push the throttle it isn't noticable. Also, sometimes when it gets cold it will die right after I start it up once or twice but then start fine. Sometimes at red lights it seems like it is missing but I have ran it with a scanner hooked up to it and no misfires or injectors fualts are coming up. I also checked for vacuum leaks and found nothing. I have double checked it is in time twice and it is fine. I was thinking I damaged either the IAC or MAF sensor when I clened them, or maybe even the TPS. My mechanic friend thinks it is the cam and crank sensor. The only code I have gotten is a p0420 (clogged cat I think), would this causs problems like what I'm having? Another friend thinks it is my fuel pump. I tested the pressure and it is just like 1 psi below specs. Could that be it?

 

[Insanejughead]

Have you checked your fuel pressure regulator. Too much fuel going through the injectors can severely hurt your engine's performance.


Also, double check your PCV system.