Repaired Head Gasket, but not running right after

1995 Chevy S-10, 170,000 miles

Ran really well till the blown head gasket, replaced the head gasket, put it back together fired it up timing was off adjusted the distributer got it back to its original place, but still engine is not running right. Plugged in the hand held engine reader everytime it says FAIL no codes come up hit erase says FAIL still check all the electical connects an everythin seems to be in back the way I started. On the carberator the two wires that plug on top, took one off an it seem to run better but still isnt right an when they are both on it seems like it is getting too much gas.