(2.3) Ok heres the problem.........Car runs like S&!#.......lol........If i snap the throttle it seems as if it is trying to back fire through the intake, If i do it slowly then I dont hear it, I believe its only runing on three cylinders, I can disconnect the back plug wire(#4) an the sound of the engine does not change, the plug is getting fire. Valve problem?

 

check the plug.

 

Check the plug and the wire. Then check and make sure the distributor is problem free. Had a similar problem with a chevy the other day and it was a detonated piston.