Mclaure

Hi, I own a Laredo 2006, due to an overheating that caused that the Jeep pauses, him change the thermostat, but apparently this not working a cylinder. They already changed the game of spark plugs and persists the problem.
Help me please, what can be the problem ?

trucker

If you over heated the engine, then it is a good chance that head gasket is blown. The head can be warp or crack too. Does the oil get "milky" ?.
You need to perform compression test. If you take the plugs out, look at which one is black or wet.

Mclaure

What happen with the black or wet ones?

trucker

black mean too much fuel. Wet mean too much fuel or low compression. Put the compression gauge on that wet one. You should have at least 100 lbs.My have 125 all.