rough idle on 95 s10 blazer 4.3 vortec vin w

Asked by Jan 07, 2016 at 08:21 AM about the 1995 Chevrolet Blazer 4 Door LS

Question type: Maintenance & Repair

Will a bad knock sensor cause
rough idle & black smoke come
out the tail pipe if u rib up the
engine it dont have mass air flow
sensor r crankshaft sensor it runs
good when I first crank it after it
warms up it starts rough idle

1 Answer

17,345

Check fuel pressure and leak down to rule out the fuel system. Is the check engine light on?

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