I just finished the headgasket on my blazer and the truck wont run right now. I got the firing order right and i didnt move the engine whil the distributor was out. It is very hard to get started and once it is runing it is misfiring. It has new plugs,wires cap and rotor. I also notice that the tachometer doesnt work at all. It did when i took it apart.

 

definetly check the timing anyway make sure all wires are pushed down all the way ext..