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Hope the new ECM takes care of your problem, Bobby. Last weekend I borrowed my buddy's 90 truck again and swapped in his ECM and the ESC module and neither made any difference. Before that I checked the wiring from the knock sensor to the ESC and from the ESC to the ECM. I also monitored the voltage signal from the ESC to the ECM. There was no change in voltage at any time so the knock sensor circuit is working fine. I even monitored the the output signal from the ECM to the distributor. It was a nice even signal increase as the timing advanced on exceleration. I also hooked up the timing light to his without pulling the wire and his timing did the same exact thing as mine, so that must be normal. I'll try the coolant sensor and maybe even IAC valve for the low idle... I'm running out of things to try. Could the CAT be clogged and causing this? The old 305 was burning a lot of oil...
So far I've changed ECM, chip, ESC, Knock, O2, TPS, MAP, Injectors, rebuilt the distributor, New plugs and wires. Also ohmed out coil. No codes or SES light...
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