I have a 90 inline 4 and it has a bad miss fire. When the jeep is cold it runs like a champ. when it is warm and i stop and turn it off then back on it has a super bad miss fire. i thought it might be a plug or something so i changed the plugs, wires, cap and rotor. i am at a loss and its killing me. if anyone has any ideas please let me know what you are thinking. oh i also checked all the vacuum lines and i have no vacuum leaks. please help if you have any idea. thanks for the help guys.