When I start my cherokee in the morning it idles up and down from about 500 to 1000 rpms. Sometimes it idles really low and sounds like its going to die, but never does. I've replaced everything from the dist. cap, plugs, plug wires, tps, o2 sensor, and vaccum lines. I reset the computer many times as well.

Once it's warmed up for the day, it idles steady.. any suggestions?

thanks.

 

You mentioned changing just about everything that could cause something like this BUT, the MAP sensor.

 

New to the xj scene, so I thought I had! Map sensor, you say? sounds like it's worth a shot

 

Grab one out of a JY XJ for TSing, for a few bucks, then if it fixes it pay the coin for a new one, or just leave the donor MAP sensor in it.

 

It's on my cherokee-to-do list now.

Thanks

 

Also check out the tps sensor i had the same issue on my 89, and i just needed to adjust the tps sensor.