I have a 2000 4.0 TJ. I was overseas for 6 months while the jeep was sitting in a garage. I had someone starting it at least once a month and put in fuel additive. About two weeks of driving, the spedo would die after the engine heated up. When I would come to a stop, the engine would idle too slow and die. Now, the spedo is out most of the time and I get the check engine light if I drive 30 plus miles or so. When I start it up after sitting the check engine light goes out and everything works fine until the engine heats up again.
I had everything checked and the error on the computer was for the spedo being out but the mechanic let the jeep sit too long so it wasn't reproducing the same results.
I've put about 5 cans of fuel injector cleaner to make sure the injectors are clean. I pulled all the relays and fuses out, cleaned the leads and box and reinstalled everything. The transfer case and axels were serviced about 5k miles ago.
When I run the a/c, the a/c unit keeps the engine idleing higher and running...
Does anyone have any thoughts?