Grand cherokee 4.7 v8 with lpg conversion (done feb 2010 ) engine has started to run lumpy and is down on power, when ticking over revs go up and down from between 5000 revs up to 13000 revs every few seconds this seems to be matched with the air-conditioning unit engaging and dis-engaging

SOURCE: 93 Jeep Grand Cherokee Won't start

The crankshaft position sensor was seriously problematic in those old jeeps. It's located towards the top of the bell housing slightly to the driver's side I think.

Jerry Koski

• 443 Answers
• Posted on May 13, 2009

SOURCE: 1985 5.7L Chevy G30 engine problem

do you shut the propane off before turning on the gas ? try turning the propane off and start the MH on gas .. The mixture of the two is whats causing the problem .. Also you need to run it on gas frequently to keep the carb wet so it wont dry up .. it might be already dried up if you run it on propane alot . might be needin a kit in it.. thanks and holler if you need more Jerry

SOURCE: 1994 Jeep Grand Cherokee V8. limited addition shuts off.

fuel filter is clogged try replacing it

SOURCE: high rev after cold start

I would agree.

SOURCE: 1995 jeep grand cherokee barley runs after warmed up?

fuel system problem; filter, pump, injectors.