my 1987 Sierra with throttle body is ideling super fast can anyone tell me whats going on ?
Check for vacume leaks.
it was the idle air control isprayed it with WD40 and blew it out put it back in and its running smooth thanx for answers greatly appreciated
Search GMC Sierra 1500 Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
GMC Sierra 1500 Experts