on 1990 GMC Vandura 1500

i have a gmc van 1989 it idles fast put in plug wires tps and map sencer and it steel idles around 2000 rpm

by in Dallas Center, IA on December 16, 2010
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1 answer 1 comment
ANSWER by , December 17, 2010
Make sure there is no intake manifold leak or disconnected vacuum hose from the intake. Zee
COMMENT by , December 17, 2010
all vacum hose are in good shap coud not find any intake leaks