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Has your mechanic tried replacing (or resoldering) the fuel pump relay and the radio suppression relay (the one that feeds positive current to the injectors)? Either one of these can cause intermittant driveability problems & stalling that would seem at first glance to be ECU or AMM problems. The loss of power suggests radio suppression relay; I believe it can be swapped with the cooling fan relay. And the fuel pump relay is something you ought to have in your glovebox anyhow as they have a habit of failing at the least opportune moments, generally on a weekend & far from any auto part store that carries it... Try those, but first start with making sure the grounds on the intake manifold (beneath the fuel rail bolts & to the chassis from the valve cover nuts) are clean & secure, as they supply the ground signal to the AMM & the coolant temp sensor. A bad ground to the AMM will definitely cause these issues, and it's not uncommon for those little ring terminals to accumulate enough oxidization to not make good contact. I use serrated lock washers between the manifold & the terminals - seems to help. We're talking a component where tenths of a volt make a big difference to the computer's perception of what's happening.
-Chris
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