Mechanics

4.3L S10 HESITATION ON ACCELERATION AT IDLE

1996 Chevrolet Blazer • 120,000 miles

Hello. I have a 1996 Blazer with 4.3L engine that hesitates on acceleration. Sitting at idle and punch the accelerator, engine bogs down and then accelerates. No check engine light comes on. Also, PCV valve vibrates like crazy even after I replaced it. If I pull the PCV valve off, there is lots of vacuum at idle and if I plug the end with my thumb, it will kill the engine. I have replaced the distributor cap, rotor, spark plugs, wires, fuel filter, fuel pump last year. Not sure what direction to take now. Thanks for any help.
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Jeb1973
September 4, 2011.



Check/replace your TPS. Check for dirty MAF. Check all vacuum lines. Maybe do a compression test. Could do a vacuum test too. And check fuel pressure just for kicks.

Tiny
Fixitmr
Sep 4, 2011.