What do you guys think?

[K-BL]

When I first startup my car after it sits for awial (like 8+ hours), it kinda sputers for about 30 seconds around 500 rpm and then its fine and also when I first put my foot on the gas it kinda wants to buck me off, and then its fine after about 10 seconds.

Also I have a slite vibration around 40-55 mph but you can feel it more when someone is with me and I just replaced plugs an plug wires and its not there when not pressing on gas.

I have a 92 MTX with a 3.2 swap. I used the full 3.2 intake and TB and I've had this problem for a long time and just got used to it because the car dosen't lack in performance in any other way.

I forgot to say that I am running a tad bit rich, but just a little.

What do you guys think?
I don't get any engine lights also.


K-BL

 

[rangerj]

Check for any stored codes. How do you know you are running rich? If you are it could be contributing to the problem. Running rich could be caused by an O2 sensor that is not switching, or switching slower than it should, or a poor air filter, or a fuel return line with a restriction, or a vapor canister system problem, and a few others such as poor ignition.

If you have an automatic trans the EGR system may be the problem, or part of it. Just some thoughts. rangerj

 

[K-BL]

My exhaust pipes are black on the inside on the tips.

 

[K-BL]

I know its hard to discribe. it acts like its been left in choke (i.e. similar to a riding lawmower in chok mode) for to long.



K-BL

 

[sideSHO]

For help with the idle you can clean some sensors and valves.
Try cleaning the MAF sensor,the IAC valve,check the TB to see if it is dirty.
They're some cheap(er) parts you can replace.
Air Filter
Fuel Filter
Thermostat
You can run some fuel injector cleaner through it and see if that helps.
Do a search for the Sea Foam cleaner.I've never used the stuff but it seems to work from what others have said.
Good luck