b18tdelsol

Hey, i've installed my crane hi-6r ignition and everythings is fine except when i let the car sit for 2 or more hours. After that, the car doesnt seem to want to crank, then i have to pop my hood, lift the negative battery cable, drop it back in, and everything is fine. What could this be? why is it, that after a certain period of time my motor wont crank? i mean, i can turn the engine off, then turn it back on, and its cool. if i leave it, like overnight, i try to crank it, it wont go.!?

help...