ConstantVelocity
New Member
The good old CAS and DFI failures are v6 things, LS1s don't have a DFI module and the CAS rarely fails. I'd be looking at the fuel system. Pumps play up when they get hot then work again after cooling down. When you turn the key to ignition (without starting) the pump should run for a couple of seconds to prime the system. Listen for this when it's playing up, if it sounds different to normal then it's probably your pump or the wiring going to it. Try replacing the fuel pump relay as an easy cheap first step.