1999 Jeep wrangler runs rough

similar problems: After 20min cool down jeep was bucking/lurching that I traced to bad o2 sensor in exhaust manifold (which you've replaced is seems). The second problem of bucking/lurching, backfiring under certain driving conditions I traced to the battery sliding into the computer wiring harness, disrupting sensor input / output signals. I cured this problem by placing a 1" spacer on rear battery clamp, pushing the battery forward. Been years and no return of problem.

Have you checked the crank sensor? They are a common problem item on Jeep vehicles.

Have you checked the firing order to make sure the plug wires are in correct order. Sometimes an engine will run but rough if 2 wires are mixed but it could be that there's more than 2 mixed up.

mine does same thing were you able to fix it yet

need new distributor and spark plug wires

does the jeep run rough and blow black smoke if so it will be the oxygen sensor if not i would try plugs and a air filter.

you check for miss how is compression

we have the same problem on our 2004 dakota. The mechanic says that it could be the exhaust vacuum that needs to be replaced. Also, they also mentioned that sometimes when the catalytic converter is plugged it acts that way also.

Let me know if this helps.

Sounds like a bad fuel injector. Shop would need to run a contribution test to confirm. I must say, good detective work, good luck.

It does sound like a vacuum leak. Get a can of WD-40 and start spraying around the carb. It will rev up, and U can pin point the loose vacuum hose, are crack vacuum hose.