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The 83 depends entirely on the ECT sensor for cold start enrichment, but these -002 AMMs aren't always "dead or alive" parts, they will exhibit degradation that can show up as a problem keeping it running during warmup before the oxy sensor is working. The trouble mimics false or unmetered air or partially blocked, dirty injectors.
The AMM is surely easiest to swap if you can find a known good one. If you can't it is best as Jarrod suggests to eliminate all the causes mimicking this lean warmup condition, i.e. vacuum leaks, dirty throttle body, incorrect base idle or TPS adjustment, injector seals, holey amm-to-throttle hose, bad ECT, manifold gasket.
When I suspect the AMM has degraded, I measure its output at rest-- ignition on but motor not running (POS II). Anything less than about 1.55V tells me the output at idle will not be enough to get the ECU to feed enough fuel to get it through warm up smoothly. Resting outputs as close to this as 1.45 meant the car was not going to start. Now, if I disconnect the AMM, the ECU knows the output is zero and gives me "limp-home" fuel.
Do you really have a 262? Bertone? How do you like it?
--
Art Benstein near Baltimore
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