Choke?

[pederl]

Question, I have a 1989 4.0, do I have a choke, my engine will start but not very good. New fuel filter, plugs, wires,

[tbrand]

If you mean a manual choke, no. Can you be more specific about the problem you're having? Does it start ok, then run rough, or is it just hard to start? You could be looking at a lot of things, including distributor cap and rotor, vacuum leaks, any number of engine sensors or a bad fuel pump.

[pederl]

I have replaced the rotor and cap. It is a manual and it starts ok, but it runs really rough.

[pederl]

I also cleaned the idle speed motor and the oxygen sensor.

[Pete M]

"cleaned" the o2 sensor?

[Naterenfo1]

Definitely could be an exhaust issue. a plugged up catalytic converter could throw your engine off quite a bit.

 

also: Air filter? make sure no rocks or anything ridiculous is in your intake.

 

EGR issue? maybe something with the EGR is being held open, and releasing way to much exhaust back in. (is there an EGR in an 89? or is that pollution pump garbage in there?)

 

good luck :waving:

-Nate