I have a 99 XJ, about 50,000 miles, stock. When I am driving on the highway and let off the gas the RPMs will drop down to 800 then back up to 1500 at about 60mph. It fluctuates like this until I give it gas again. When the RPMs drop it also slows me down. Anyone have any ideas? I took it to the dealer and they looked at me like I was an idiot. The mechanic test drove it and told me to try cleaning the IAC and the throttle body. That didn't help. Anyone ever have this problem before?
Thanks in advance
Shawn
Thanks in advance
Shawn