Class A 1996 Chevrolet 454 engine starting problem

On the TBI GM Motors the module in the distributor will cause this issue. Random starts then No start at all. Easy to change and not expensive. If this does not solve it then connecting a fuel pressure gauge to the port in the rear of the TBI to test Pressure. Peak Pump pressure on the TBI motors is about 15-16 psi, and regulated by a regulator in the back of the TBI, There are way to change the regulator pressure but would have to look up how to do it, but the regulator is not your problem anyway.