the jeep starts, idles, and runs fine but when driving on the hwy (65+mph) at about 2000 to 2250 rpms the engine hesitates, jerks almost like it misses pass that point its fine and also before too. at times when in traffic stop and go it'll die out. the jeep has a 6 cyl standard transmission.
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2002 Jeep Wrangler Question: misses at about 2200 rpms
Answer #1patrick mannion from Greg Solow's Engine Room, October 21, 2009, 20:42Master
Sounds like ignition system problem but I would also verify fuel pressure and delivery with a fuel pressure gauge "tee-ed" into the fuel line and taped to the windscreen during a test drive.
It is hard to guess without being able to experience the problem first hand your car's computer controls the idle speed electronically. I wonder if there is a problem with the idle speed control system or some other under lying problem. Your car has on board diagnostics level 2 (OBD2) a 16 pin socket under the dash allows the computer in your car to be interrogated using a scan tool to read live sensor data that may point to the problem with out having to do extensive testing at each sensor. Interpreting all the sensor data can determine if a particular sensor is failing, the engine is mis firing, running to lean ect..... Plugging in a professional grade scan tool is often the cheapest and most efficient way to find drivability problems.