I have a 5.0 Gi pwtr ser# 4110187166(?) that I have just replace the head gasket. I have set the timing by sound (an marks made before taking distributor off) and it is running fine. I have tried to time it by the sticky for Delco EST but every time I unplug the 4 pin connector to plug in the initial timing connector the engine goes dead. Right now it is set TDC at idle but idle is (high) aroung 850 rpm.