97 f150 4.6 missfire I cant figure out

Question

Ford f150 97 4.6 Missfire I took it to autozone for handheld diagnostic it said

o2 sensor I changed both (nothing then a retest said egr valve so i replaced egr sensor ( nothing then replaced egr valve (Nothing then new plug wires & plugs

nothing I took it back for a retest now it reads intake temp. sensor I feel its got something to do with the mass air sensor can anyone give a hand it also reads system to lean and evr insaftiant flow

Answer 1

it might be a vacuum leak. take some starting fluid(when its cold) and spray around all vacuum fittings and the intake gasket. if you have a leak, you will know it by the idle.

Answer 2

A misfire wouldn't be caused by some of things you've just mentioned. If you changed the plugs and wires, but not the coil packs, that's where I would look next. There's not much else to look for except low compression in one or more cylinders.