Fuel pump NG
A BAD CRANK SENSOR WILL CAUSE NO SPARK AND NO PULSE SIGNAL TO FUEL INJECTORS a bad ignition module will cause no spark its located under the ignition coil trio pack
One of the fuel injectors in the throttle body may be leaking.
could need a tune up or could have some bad injectors
Fuel pressure fuel injectors ECM and various sensors
Try cleaning the intake manifold.
Need to replace the ingnetion module in the distributor.
Perhaps you need to try a higher octane fuel i.e. 89
The 4.3L engine has two fuel injectors located in the throttle body.
That sounds like a stuck relay.
possible causes are dirty injectors or loose connection on high tension cables from distributor to the plugs.
its right on your throttle body behind your injectors on the same assembly. if you want to change it, take out your injectors but replace the whole bracket with the regulator on it. there is a spring in that regulator that will fly out if you take it apart, plus there is a good chance it will leak after you get it back together
the fuel injectors are located under that big plastic thing on top of the motor .