Could still be a bad ECM. Pull the ECM down and start the car. While it's idling LIGHTLY twist the ECM and see if it kills the motor or makes it run rough. Sometimes a bad connection will only show up this way.
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--==RPM Resto & Custom==--
1989 IROC-Z Media Coverage:
Chevy High Performance - Readers Rides 4/03
GM High Tech Performance - Tech Article 3/06
Chevy Rumble - Tech & Feature Articles November 2006
Auto Restorer Magazine - Feature Article 5/11
SkinAndSteel.com
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