i have a 1990 iroc 350 and it has been acting funny lately sometimes i go to start it and it will fire up right away then other times it will simply turn and turn not fire i checked the fuel pressure and it was kinda low so i replaced the pump now i have 47 psi at the rail i pulled out the number one plug wire and let it rest on the manifold as i turned the engine over and i didnt see any spark so i replaced the coil with a msd street coil and same thing no fire let it set for a few hours and then it fired up it has a new distributor and cap in it could it be the module for the ignition bad thanks for any help i get