got truck used had blowed headgasket. brand new head all new intake and exhuast side gaskets block is within spec. deff in time have set it 10-15 times and checked it with my timing light. truck starts idles perfectly. give it throttle very very slowly itl rev as high as u want it to give it throttle like you would to pull out it just cuts out backfires and chokes out never does die though. timing advances when u give it throttle. new plugs wires have distributer on way tried 4 diffrent ecms......same symptom have tried doing the check for engine codes but cant get that to work at all. plugs seem to be very rich but that was after i had been trying to get it to take throttle. any suggestions? truck is a 1990 b2600i has a little under 180k no rust on truck anywere 5 speed would really like to fix

 

I know this is a long shot but did you ever fix this issue. Mine is doing exactly the same thing

 

Gona sound crazy but change fuel pump there 2 stage “low and high” can fool u ins heartbeat bro. Fixed mine right up. An advance oriellys fuel pumps go bad constantly

 

Thanks mate. One of the issues that I had was very rusty fuel so I removed the pump and raised it about an inch hoping it would fix the problem of pulling **** from the bottom of the tank. Fuel now comes through clean but maybe the pump is full of rust. I’ll get a new pump and try it. Thanks again for your help