I have an 87 comanche 4.0 auto and sometimes the engine shakes but when I shut it off and start it back up it stops shaking and runs smooth. When it shakes it sounds like it misfires and the exuast smells like half burnt fuel. I replaced spark plugs and wires a year ago, all the vacuum lines seem to be in place. Any suggestions help. Thanks for looking.

 

Check the integrity of the line from the throttle body to MAP sensor.

Also, click on the PINK link below and do Tips 1 through 5 thoroughly.

Oh, and BTW, WELCOME!!!!