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Discussion Starter · #1 · (Edited)
I have been working with a 99 Cherokee with IL6 4.0. Vehicle had intermittent stalling and rough idle, had to use press accelerator while starting. It originaly had a code for TPS high input, owner replaced TPS. Code persisted. Checked wiring harness, voltages, cleaned grounds. No issues found, cel stayed off. Idled good, placed into reverse, engine began surging; now surges in park and all gears. Replaced plugs, dist. Cap, rotor. Fuel pressure is stable at 50 psi. Replaced IAC, it fell apart when I removed it. Replaced crank sensor which cured hard start but made surging worse. Unplugging TPS makes engine smooth out. Exhaust is Very hot. I am pretty much out of ideas at this point. Does anyone have advice on this? It would be wonderfully appreciated!
 
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