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high idle upon start, then falls and hunts. AMM? 200 1991

posted by  someone claiming to be townes on  Fri Dec 31 18:48 CST 2010 [RELATED]

First off, the update on the 91. Replaced the plugs (one was loose as I mentioned earlier), cleaned the IAC valve, put a bottle of techron in and filled up with 91 gas, seemed to be idling better and driving fine. Half way to the pick a parts the check engine light came on. No change in how it was driving though. I picked up a brand new appearing IAC valve and bellows for AMM/throttle body, put them on and it appears to be running fine, though the check engine light came on again.
Not sure where to look next. Do I still suspect the AMM? I saw one at bone yard that appeared almost new and very clean on the inside. I hid it in case I need to go back and pick it up for 50.00.

Thanks, Kirk

p.s. The 84 died and I haven't gotten it going again. I just tried another fuel pump and same no start. Cranks, getting spark, I can hear the fuel pump but no go.
It has 320k on it and was running perfectly. Wife got in to pick me up at mechanic where I'd just dropped off 91 and it died. Mechanic gave me a ride home, felt the fuel pump as I cranked and told me it needed a new pump. I put one on that I picked up at bone yard and same thing.






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