Hi guys i have a 97 f150 with a 4.6 137,000 miles. I'm at a complete loss on my truck started out with two cylinder misfires 4 and 1 so i changed plugs, plug wires, both coil packs and misfires are gone but still not fixed idle fluctuates around 500 rpm try to drive it no power sounds like its missing but no codes cleaned throttle body replaced iac, tps, pcv and pcv tube cleaned maf sensor and replaced fuel filter still not fixed and no codes don't know where to go from here any help is greatly appreciated thanks

 

Try a bottle of Techron in the gas.