I have seen many of these Vortec engines. Most of them will not start until you release the key from cranking. Is this normal? The current truck I am working on is very hard to start and will only fire one out of ten times. Once it is running it is good and strong with no codes. I have excellent spark while cranking, the fuel lockoff is energized. Does anyone have any technical information on this tier II Impco?

ltrm812 at gmail dot com

Thanks