wires. has gas but wont crank? i changed my fuel pump today but it wont crank. when we got all the parts back on the truck it cranked and i drove it to the store. i wen back home and left shortly thereafter. i drove a couple of miles and i noticed it was acting as if it wanted to go dead. i pulled over and turned it off but it cranked back up. i drove a little furter down the road, it did it again, i cut it off and it acted as if it was trying to turn over but wouldnt. any idea whats wrong?