Leaderboard

ended up finding a 99 buick park ave ultra .bin then using that and im happy with that because its os is still compatible with hp tuners now i need the 2 speed fuel pump!!

Obtain the service manual set for your vehicle. Look in the wiring-diagram section, find out how the ECM is powered. Verify that wiring for loose connections, weak fuse-blade terminals, broken/intermittent wires, etc. I would want to connect a scan tool, and see what other info I could get that might be useful. Verify EVERY sensor and computer output. Wouldn't hurt to check the battery connections, too. Assure that the battery isn't losing voltage while parked.