90 astro/chugging,stalling

well now, when i start it , sometimes it stalls, kinda hard to start too, never was that way, checked all the vac lines, one was off, the one to the vac ball under the condensor, checked the purge tank lines too, they wwere ok, now i put a can of seafoam in the upper end and in the gas tank, after a few days i experience problems of rough idleing, stalling and chugging up to 20mph then it quits, plugs good, pvc changed, not sure if its a fuel filter or weak pump, injecters are clean but i had alot of carbon buildup around the bowls, and for a couple of days i had to unplug the vac line leading from the vac bowl to the manifold, but since then i have plugged it back in

shroom, it might be the fuel filter. Seafoam will work loose gunk pretty much anywhere in the fuel system. Some gunk may have come out of the tank or the fuel pump and clogged the filter.
Also you might pull your EGR valve and make sure it's not clogged.

well now, when i start it , sometimes it stalls, kinda hard to start too, never was that way, checked all the vac lines, one was off, the one to the vac ball under the condensor, checked the purge tank lines too, they wwere ok, now i put a can of seafoam in the upper end and in the gas tank, after a few days i experience problems of rough idleing, stalling and chugging up to 20mph then it quits, plugs good, pvc changed, not sure if its a fuel filter or weak pump, injecters are clean but i had alot of carbon buildup around the bowls, and for a couple of days i had to unplug the vac line leading from the vac bowl to the manifold, but since then i have plugged it back in
If you got carbon build up there, look at the Idle speed control valve