So I'm having some problems with my 86 F250 4x2, with a 460. The truck starts idles up then after about a minute it dies. I rebuild the Holley carb, put in new fuel filter and the pump works for sure. I can't figure this out. I did just do a new timing chain install and the timing is close, not exact as it won't run for more then a minute. Emmisons have been removed besides the PCV valve. Any help would be great.