Got a 89 Chevy C2500 8600 GVW 2wd 5.7 400 trans. VIN# 1GCGC24K6KE120050with many miles in from another shop. The check engine light will flicker with the key on or running. They replaced the computer and prom with part # 122747 ECM and 16121134 prom I think th... Login to read more.