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Sounds like you have a failing AMM. If it not doing its thing, all the time the car limps!
I would want to blame the wiring harness on this year car!
You may have to cut open places in the sheath and see where it has "biodegraded" insulation.
I like blaming engine cleaner that lays behind in the harness and cooks off but all the 83's to 87's cars suffered some issues.
Usually happen under the intake manifold and up to the firewall as the first place that goes!
It can also be the connector pins on the AMM. They can become corroded or are pushed back up inside the connector as they can get sprung.
Hope this helped?
Phil
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