84zmyfavorite

Just bought my 9th Jeep(in possesion, #15 total) last Friday, a 1993 Dark Green Limited 318 Grand, $300, blown out drivers front tire, smashed passengers side lower control arm, and a engine problem that the previous owner described almost perfect. After 30 minutes of run time, regardless of ambient temp or what kind of driving, could be idle, She starts running real rough. Misfire, wont rev above 1500Rpm in neutral, will barely drive unless down hill. Runs like a Champ, up until the 30min mark. The pervious owner has replaced the obvious, and says His certified mechanic father thinks its the ECU. 1993 ECUs are not resined well enough, and when heated, connections pull loose, He says. There Is a collector leak on the ECu, passenger side, Right below....There Are Alot of new parts under the hood, including CPS. Old TPS and MAP though.

incross

Any error codes? I would guess its the fuel pump or regulator.

Bustedback

Check the fuel pressure when it starts to run crappy.

ShowMe Cherokee

Could it be heat soak of the injectors? Is there shielding on that engine?

Bustedback

Not an issue with the V8.

84zmyfavorite

She does have good fuel pressure at all times.

Bustedback

You may need a fuel pump then.

dave1123

Didn't you mean filter, Busted?

Bustedback

Brain fart, yeah filter...maybe

Greenanddead

maybe the intake manifold gasket..? that happens on my dads camaro, runs great cold but when it warms up, NOPE.

dave1123

Oh, yeah. Isn't there a gasket on the bottom of the intake plenum that sometimes is a problem?

Bustedback

You may have a clogged catalytic converter.