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My 1995 Z28 starts then stall with 20 seconds I have installed new fuel pump, I now have 45 lb fuel pressure ,I also changed ignition switch. If I unhook mass air sensor car starts and runs I replace mas with new one and car does same as before starts and then stalls unless I unhook mas then it runs. I checked wires one has 12 volts and another has 5 volts.does any one have ideas whats rough.
 
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