So i picked up the 89 f-250 5.0 manual. and man did it run rough. So i did plugs wires and cap and rotor with good stuff. now the problem sort of went away but not completely. So I started pulling wires of the cap one at a time and think i found a few plugs that were not running quite right or total at all, what would make a plug not contribute to the running of the truck. What the problem is i have a lack of power, the motor runs rought, idle roughs, has to warm up to be able to even move. burns up gas, kinda expected it. any help here?