motor mount? I suspect you have a broken motor mount.
An ignition miss would occure at those times. Especially at 50-55 mph, I would suspect secondary ignition components... Plugs, wires, etc...
Engine miss.
air leek
It is the idling sensor on top of the intake
Yupp Clogged fuel filter. Hole in the gas line.
Possibly. The main thing it can cause is severe engine wear. Too much oil is just as bad as too little.
Is the AC turned on?
An engine revving to high RPMs could be a symptom of many conditions. The potential cause?æalso depends on whether this happens?æwhile idling or while driving.
There are several things that can cause your Jeep to stall while idling. The timing may be off or your fuel filter may be clogged.
The most likely cause is a faulty engine crankshaft position sensor.
you are flooding the engine
There are several things that could cause this. The first thing to investigate, though, is the idle speed your engine is set at. As with any engine, if the idle is set too low, the engine will not continue running.
The spark plug gap can cause the RPMs to fluctuate, while idling. The more probable cause of the fluctuating RPMs is a bad camshaft.