I have a 2002 ls6 engine going into a 72 chevy K-10. I'm useing a new wireing harness from speartech and i'm running 2 fuel pumps. when i hooked up the factory Z06 computer and turned the key, the fuel pump relays freaked out and started to pound on and off. I had the computer reflashed and the prolbem went away. the truck sat without a batt for 2 weeks and when i put the batt back in the computer started to have the same prolbem again. why is it doing this?