Engine stalls at idle when I put in drive. It feels like it's missing. on 1990 Chevrolet S10 Blazer

Sometimes it'll stall without putting it in drive. I can pull each plug wire off one at a time and it stalls,which makes me think each plug is firing. I recently replaced the coil. I cleaned the portal for the IAC and even replace the IAC. No change. This is a 4.3 V6 engine.

by in Fort Pierce, FL on February 07, 2013
2 answers 1 comment
ANSWER by on February 07, 2013
Check for vacuum leak(s) more likely EGR valve is stuck open!!!! Tap it with a wrench, or such, to see if that helps.
ANSWER by on February 08, 2013
agree with wetry. try having a smoke test done to find source of leak
COMMENT by on February 27, 2013
Problem solved. I can tell you a lot of things it is not (because I replaced some parts). The real problem that fixed it was the IGN Module inside the base of the dist. Thanks for the suggestions. Cliff.
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Sometimes it'll stall without putting it in drive. I can pull each plug wire off one at a time and it stalls,which makes me think each plug is firing. I recently replaced the coil. I cleaned the po...