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Hi all - I am replacing the entire coolant system in my 99 TJ. I have had a local shop tell me all of these Mopar parts are discontinued and the only option is aftermarket. They also said to be careful buying parts from Amazon as it may be a 15-year-old part that won't work correctly because...

Found the culprit. Crankshaft position sensor. She’s running like a champ now

When its cool it does not miss nearly as frequently as it does when its at temp. At a higher rpm and load it will miss when its cool. It will free rev to 4 when it is hot with no load

Thanks guys - I'm going to remove cats this week. More to come. I appreciate the help!

Yeah I messed up not taking pics. Jeep seems to run fine until it warms up and then begins to miss at higher rpms and more load. As it continues to run it just gets worse to the point its missing across the rpm/power band.

it was equally crappy on all plugs. However - I should restate my comment "lots of carbon". As I look on the interwebs at pics of sparkplugs, relatively speaking my plugs were pretty normal. They may have been original plugs. I'm at 103k miles. There were carbon deposits but after looking...

Lots of carbon.

So I have reset the computer. Still the same issue. I think I am going to replace the cat. I am debating on replacing the manifold too. Mine has a leak. May as well while I'm at it.

Interesting. Mine flashes, RMP, and MPH gauges bounce around and it goes back to normal or just repeats a few times as it misses.

did the check engine light just flash though? Mine does not stay on long enough for me to get a code.

Thanks!

pretty bad.

I did not. How do I reset the computer?

unfortunately, the saga continues. Changed the upstream 02 and the conditions remain the same.

will do - Thanks!

seems to run perfectly

99 TJ - this all started last week. Driving down the highway I noticed a bad miss and my check engine light flashed. This continued intermittently until I stopped although the miss and check engine light flash did decrease significantly as I had less of a load on the motor. I drove home and...