Hello Forum,
I have a 2002 GC with about 66,000 miles on it and I just did a tune up last week and not it seems that it is surging at idle and when driving. The surge seems like it would be a misfire but I have triple checked the plugs and wires and they are fine. Last time this happened we took it to the dealer and they "connected a loose wire" anyone out there might know what wire or hose they are talking about. My wife is the one that picked it up or i would have found out what wire it is... It must be something common that gets bumped when doing a tuneup.

 

Also it does not show any error codes

 

Did you have this problem before the tune-up?

 

No i did not... It was just the routine time for the tune-up. I repleaced the following

Plugs
Wires
Air Filer (Put a K&N in now)
cabin air filter
rear shocks
Oil change

 

Recheck the spark plug wires. Add a small amount of grease on the coil pack and push the wires back on until either you feel it click or hear it click into place.Do the same to the spark plugs too. Also clean the throttle body blade as well.