I got a 2000 blazer with a 4.3 just got done replacing the head gaskets. Put it back together and it won't start. Checked and doubled checked timing and it look ok. Engine spends as if it don't have compression. The only thing I can think of is a connector that I can't find a home for... there are 2 wires 1 yellow and 1 black connected together on the drivers side coming out of the main harness. Any ideas?? HELP!
One more thing engine started fine before replacing gasket.