Just bought a 2001 DeVille, 4.8 Northstar, 25000 miles. Engine performs fine except that idle rpm is 650 after engine warms up. Every other GM I've owned idles at 550. Is 650 the correct idle rpm? If so, thanks for the info, if not what is the correct idle rpm and what could be wrong with mine?
Thursday, February 8th, 2007 AT 10:58 PM