Thread: 89 S10 4.3 misfire
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Old 06-27-2020, 04:02 PM   #9
Wrenchbender Ret
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Join Date: Oct 2005
Location: Overland Park, Ks.
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Re: 89 S10 4.3 misfire
If it has a vacuum outlet on the back part of the intake manifold, a vacuum leak can cause a misfire like that. Check power brake booster & trans modulator & a/c vacuum resavoir.

George
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