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**Cali72K20** · 11-30-2015, 12:19 AM

Check your distributor. Mine just failed while driving, no codes other that 12. I had to have it towed home thinking it was a fuel issue. The reluctor wheel, looks like a star on top, just came apart in chunks, it was all rusted out. I had just replaced the cap, rotor, wires and plugs only 8K miles ago and the distributor looked just fine. I replaced the IAC at the same time as the tune up, because of the idle-same exact problem you have now. Mine has 140K original miles. NAPA part number 48-1635. She fired right up first try and purrs like a kitten!!!!

11-30-2015, 12:19 AM	#14
Cali72K20 Senior Member Join Date: Aug 2013 Location: Northern Santa Barbara County, California Posts: 2,671	Re: '89 S10 4.3 erratic idle speed Check your distributor. Mine just failed while driving, no codes other that 12. I had to have it towed home thinking it was a fuel issue. The reluctor wheel, looks like a star on top, just came apart in chunks, it was all rusted out. I had just replaced the cap, rotor, wires and plugs only 8K miles ago and the distributor looked just fine. I replaced the IAC at the same time as the tune up, because of the idle-same exact problem you have now. Mine has 140K original miles. NAPA part number 48-1635. She fired right up first try and purrs like a kitten!!!!