unit (3000mi old). The engine harness is about the same age. All plugs new condition, always use dilectric grease, no corrosion. Plugs are plugged in to proper connections. I honestly think the ecu has lost it's mind when it comes to the IAA unit. Forum member is loaning me another ecu to test this theory. Should be here in a few days. Anyone had an ecu partially fail? Sounds like I'm grabbing at straws.