My 4.0 Sahara is running really rough, it doesnt do it all the time but often while your out driving it, the revs will jump up and down like crazy and then the engine will cut out, it does it in all gears??
We took it into our local jeep dealers and theyve been working on it for 2 weeks now! They cant find the fault, they've replaced the complete electrics, the Idle Air Comtrol Motor, all service parts?? We picked it up tonight thinking it was fixed but we only got 10 miles from the dealer when it did it again on the ring road doing about 50mpht!! We took it back but the mechanic says hes going to leave as hes never had to work on such an annoying vehicle
it sound liek an air leak to me but they cant find one