K my 2000 Cherokee 4.0 is missfiring and chugging on cold start up. The longer I run it the more often it will randomly go back to normal. Then it will start chugging again? And help would be appreciated!

 

Anyone any ideas? It has stumped everyone I have asked!

 

Any stored codes?

 

My 01 does the same but only when it is started with the temp about normal running. It did it oneday and i ran the code was a cylinder 3 misfire. I just never really cared cuz if i get on it down the furst street it runs fine.. so weied.

 

Mine has cylinder 4 miss fire and doesn't get better

 

Bump

 

Come on guys any ideas I don't want to start randomly replacing parts

 

cylinder 4 misfire... have you looked into that?

 

If its a missfire then it is most likely In your IGNITION system somewhere, Try swaping a coil and see if the code goes from cylinder 4 to what ever cylinder you swaped it with. Probally a bad coil pack. Also check all you connections and make sure they are good. Dont forget to check your grounds too

 

You have heat soak use the search to find cure's.