I put in new fuel filter, air filter, and replaced the plugs with some motorcraft plugs, I think this should do it. When I pulled out the old plugs there were tarnished pretty good with combustion residue. Anyone know what the original brand of plugs in these things, looks like when someone did a tune up they just replace wires because this plugs were worse than anything I've done before. Also, this thing was a PAIN to do plugs, would of been easier to pull the motor. Passenger side plugs the most forward one had me scratching my head for a while, any suggestions for my next tune up, or just grin and bare it?