Hi, thanks for reading! I have a 1981 K2500, 5.7 ,had sat for about 3-5 yrs. did heads, plugs, new hoses, lines, filters, etc. Rebuilt carb, distributor. Couldnt get it to pass CA Smog. It was originally 5speed, swapped to auto. Just bought new carb, thick gasket, heres my problem. It will turn over, wont stay running, backfires and stalls. Oh 1 more thing. Helped a friends elderly parents w/dump run, they had gas for me, long story short, some ahole stole the gas & replaced it w/WATER! Anyways, fixed that. It has federal emissions too. Any thoughts/suggestions greatly appreciated!