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Originally Posted By: jeepman3071 That's extremely odd to have all 4 O2 sensors pop up at the same time. Definitely check for vacuum leaks, possible crank position sensor. I've seen the crank position sensor cut power only at specific RPMs in its early stages of failing. TPS is another...

I will have to check the injectors then. I had just mentioned that to my wife & then came in here and seen your response.

Yes same year motor

I have a 99 Jeep Grand Cherokee Laredo 4.0 LTR 6 w/auto trans. While driving down the road & attempt to give it more throttle (ie: to pass another vehicle) it will "buck" once it tacs at 3k. This will do this each time. That problem became more erratic yesterday afternoon coming home. Acting...