1999 Cherokee XJ Stumble

[NickMaul]

Currently driving a 99 4.0 auto as a DD. At the moment it will randomly stumble/hesitate under throttle. Never cuts off or a CEL. I verified that the fuel pressure is correct and no fuel leaks. I am thinking of doing a tune up. I took some screen shots of the O2 sensor voltage with cruise on flat highway doing 65. All of these pictures were taken in order like every 15 seconds. Does this look reasonable?

This last picture was taken at the end of my 20 minute drive idling at park.

Everything look okay?


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[a_kelley]

Yep. Looks fine. Upstream toggles and downstream "floats". Inspect cap, rotor, & wires.

 

[GotWood]

Check wiring loom across the firewall, it will lay against the fuel rail and ground out .Zip tie out of harms way.