Smta

Didn't think about dash light being burnt.. will check it out next week also will check speed sensor.. thanx for the ideas..

The Jake's work great once  in a while when they decide  to come on.. the high idle has me a little more baffled.. and there is no extra lights on In the dash. 

Newbie here with macks, we have a 2000mack cl713 e7-427 thats been having a couple issues the past year.. its had an intermittent hi idle and jake brake has been coming and going. the tack bounces around a bit but it used to read around 4-500 at idle but now only drops to 6-700rpm. the first thing the driver noticed was the jake not working so we rebuilt the jakes W/ new seloniods new in dash switch, a couple new wires ends, and updated/hyflow oil pump. then after the report of the idle we got a new electric foot throttle, ours had a flat spot on it.. any thoughts would be help full, we don't have any close shops that can hook to the computer but we may have that next on our list..