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Went back with a MM and a homemade Noid light. Yel/blk wire on #4 was getting 12v, the yel ground wasn't getting jack. Depinned A1 on the ECU and ran a long wire from injector to A1. She ran like a champ. It was getting dark so I packed it up and put everything back like stock so I'd have a clean slate for running a bypass another time and we cranked her again for shiggles. Runs fine. Test drove fine. Chalk it up to new owner luck? The ECU harness looked pristine for 20 years old, no corrosion.
Thanks for all who suggested things to try.
Now all I need to solve is the "slow response" O2 code (P1163? if I remember) that comes and goes.
Mak
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