i have a gmc van 1989 it idles fast put in plug wires tps and map sencer and it steel idles around 2000 rpm
firstname.lastname@example.org on 1990 GMC Vandura 1500
1 answer 1 comment
Make sure there is no intake manifold leak or disconnected vacuum hose from the intake.
all vacum hose are in good shap coud not find any intake leaks