The 99 starts and runs like normal, then suddenly CEL comes on gauges jump around and It get a few hesitations. Not seeing any codes? I opened hood and wiggled wires harness anywhere I could reach. But can't get it to do it while parked. Any thoughts?

99 Cherokee 4door 4.0 260,000 miles

 

Anyone?

 

So you've hooked up a code reader or a scan tool and there are no codes?

Might want to try freshening up your engine grounds.

 

Correct, there are no codes stored. I did clean up the battery connections, I'll see what that does...
Thanks!

 

Clean battery connections are important, but don't forget about the actual engine grounds. Here's more.
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Grounds can be the root cause of many electrical gremlins. Refreshing grounds is NEVER a bad idea, and the investment of your time in this procedure is always well worth it!

You can't tell much of anything by looking at ground connections!! You must remove, scrape, clean until shiny the cable/wire ends and whatever they bolt to. Be sure to remove all paint from any ground connections.

Start with the one on the back corner of the head, and where it attaches to the firewall, as it deteriorates over time and is an area that makes it susceptible to damage. Best to replace that woven cable with a #4 or #2 gauge cable. You can attach the one end to the intake manifold if you would like.

Next go over to the engine dipstick tube stud. Remove the nut and clean the wire ends and scrape the block until shiny at the stud. Reattach tightly.

If you are so inclined, add at least a #6 cable from the negative terminal of your battery to one of the bolts on your radiator support.

 

https://www.cherokeeforum.com/f2/gre...e-6558/index4/

You may want to open this link and scroll down to post #49.

It shows pics of the ground points in your '99 engine bay.