l have a 1994 4.3 cpi 4x4 l have put new timing chain,iac,tps,dizzy,wires,spider,egr,.it will run great if I unplug the alternator but if l plug it back up it will die and l can crank it back up but will not run cuts off like it runs out of gas ready to have big fire with it help please what can it be

 

Have you taken the alternator in for testing? I'd guess at the alternator as the problem though. I'm betting if you check the +12V at the PCM with the alternator plugged in and the key in the 'on' position, you'll have a low voltage.

 

yes l took it and had it checked.they checked it three times showed good.driving me crazy