I have a 1995 4.3 vortec. I am having issues with it running. It seems to run sometimes and when it runs it runs great. I was driving it home a few months ago and it kept wanting to bog out. Since then I have replaced the fuel pump,sending unit, pressure regulator, and the fuel filter. I had it to a well known mechanic in the area and he found nothing wrong with it. I bought a new PCM for it and the chevy dealership installed it. It has been parked for a couple of months now I went outside today it fired right up. I drove a few miles and it ran great. I brought it home and cleaned all of the grounds and started it and shut it off about five times. I went back out about a hour later and it would not start. Any ideas would be helpful thanks! This has just been a nightmare nobody knows what is wrong with it.

Oh ya I put new plugs, and wires in it also. When I turn it over to try to get it to start I have took a pluck out of it I believe that the plug is supose to be a little wet but they are dry.

 

*Moved to '2nd Gen Tech'. The 'New Member' section is not for asking technical questions.*

 

Find the two wires that come out of the lower intake manifold under the throttle body. Pull on them just a bit and see if the truck starts. If it does, you need to replace the connector on the fuel injector inside the intake. It is actually a pretty common problem. The connectors are cheap too. Just requires popping off the upper plenum cover again.

 

I will give it a shot thank you!

 

I treid it pulled them out a bit and still nothing. I even had my dad try starting it while I was wiggling the wires in and out. I called oriely and the guy said it may be my spider injectors. I got the carfax on the thing when I bought it and the injectors were replace once already. I hooked a scan tool up to it this morning and the stupid would not respond to it. I guess it time to break out the OHM meter and check everything :P. If you have anymore advice on what it may be it would be greatly appreciated. I love my Blazer.