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Re: '89 S10 4.3 erratic idle speed
They were vortec heads on them so it is a vortec, just the begining year. If its pulling up codes is buy myself a Haynes book and get a paper clip and start checking codes. It will at least bring you into the ballpark with what's wrong instead of replacing things that shouldn't be replaced. It could possibly be tps, egr, map sensor, list is limitless on what it could be. Your s10 should know what it could be by using the pins below the dash
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1995 s10 blazer 4.3
1967 c10 350/350 fleet short
1993 s10 blazer 4.3l 4l60 RIP 6/20/14
2000 mercury sable
Thats a how I roll
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