Re: '89 350 tbi 5 speed stalling and surging idle
Could it be the dreaded EGR problem?? I know mine idled like that when it had a bad and then incorrect EGR valve on it.
I would go with Chevytech's recommendations at a minimum. He is VERY good and methodical at diagnosing things via the board (which is hard).
Keep plugging away at it and walk off when you get mad. Eventually you will find the problem. I know this from experience.
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2006 Silverado CCSB, 1939 Ford Sedan, 1962 BelAir Wagon, 1976 Vega Panel
Charleston, South Carolina
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