I have an '88 K5 Blazer With a 350 and throttle body injection. It won't start. It was running fine when the check light came on and gave me a code 32 - the EGR circuit. Two days later and it would start but not stay running. I replaced the EGR solenoid and tested for 12 volts and pressure- that seems good but now the truck won't start at all. I also found a bad vacuum hose and replaced several hoses.
The problem is that I'm getting no spark at the plugs. I tested the coil and it seems fine and I get spark at the coil wire. The plugs, wires, cap and rotor are six months old and in good condition.

What else could be causing my lack of spark?

 

try replacing the cap.. maybe this one is bad.. they are made in mexico now.. be sure to get ac delco.
happy new year