Picked up a 95 transport 3800 plastic upper intake that has been sitting for some time. It runs fine but the idle speed increases when warmed up to temp. It goes from 700 up to 2000. Turning off and restarting brings it back down but it then rises again within 5 min or less. Check engine light is on but I have not got codes.
have the same problem?
Tuesday, February 9th, 2016 AT 12:49 AM