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4.0L Start Up Surge


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So not directly on a comanche but on my 99 Cherokee after it has gotten hot and you shut it off and start to go again. The first time it tries to go from 1st to 2nd it really surges and sputters and almost stalls. It only does it one time then it is fine. Untill the next time you shut it down and restart it. I know a lot of people have done swaps to modern 4 liters so any help would be great. It has new plugs, wires, cap, my thought was throttle body sensor, or maybe the MAP but since it will literally only do it once per cycle I have no idea.

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Agreed.  Try this to confirm:

 

Start the engine, and while it's still stationary, run the throttle up to about 2000 rpm for about 10 seconds, and then idle back down.  Then put it in gear and drive away.

 

If the problem is gone (or substantially reduced) it's your fuel line that is filled with percolated fuel due to heat soak.

 

Fixing heat soak requires shielding/insulating the fuel line in the vulnerable areas (near the exhaust)

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