Located west of phx, G56 truck, Not sure what exactly is wrong. just lost my patients with it and replaced it. Was pulling a hill loaded with horses and engine made a pop, started missing and temps shot up. Limped it off the freeway in 1st, Got another truck to pull trailer and drove it home and in the shop...... HG,injector,dropped valve????? not sure. Problem is in # 3+4 cyl. Will include ECU for the right money.