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Re: What would cause this???????
Since you have an ignition control circuit code I would also check for play in the distributor, with 220k Miles on it it may have alot of play in the bushings. My friends 93 Suburban was kicking out that code and a new distributor fixed it, had alot of play in the distributor shaft. (easily checked, remove distributor cap and rotor and then see if you can wiggle the shaft from side to side, if it moves then your bushings are worn out)
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