Is the engine light on? You say you did a tune up what did you replace? I wouldn't hurt to get a can of seafoam and put it in the gas tank next time you fuel up.

Answered by racefan966 (expert)
4,866 answers provided

Engine light is not on. I have tried seafoam. Tune up included spark plug changed and belts.

Response from diane j
1 question asked

When you replaced the plugs what did they look like ie- black, white or? Have you replaced any other parts? which engine is in it? How is the power?

Answered by racefan966 (expert)
4,866 answers provided

Dont know the color but I have not replaced anything recently. Power is okay. The rpms are normal. V6 engine. I did have the trans module replace in January

Response from diane j
1 question asked

I do believe that this Jeep has a mass air flow unit. What I would like you to do is buy a can off mass air flow cleaner and then remove the mass air flow and spray out the inside of it (cleaning it) and put it back and let me know how that does. If the sensor wire inside it dirty or? then that can reduce the mpg and sometimes alot.

Answered by racefan966 (expert)
4,866 answers provided