burke8810

I have a 97 f150 4.6 140000 miles last winter it started running bad it was missing and backfiring so I changed the coil packs plugs plug wires air filter fuel filter still didn't fix it so I ran a can of seafoam through it and it ran fine didn't have any more problems with it till this winter it did the same thing so I ran a can of seafoam through it again that worked for about a month and now it's happening again only this time seafoam didn't work any suggestions on what it might be? When it starts running real rough the cel starts flashing

97_lariat

Stop using deadpan for one. That ****s the devil. But try replacing your injectors, I've had the same problem and that's what it ended up being

Krack499

iTrader: (1)

Why not try injector cleaner before changing them

burke8810

and I forgot to mention all three times it's done it has been while theres a lot of snow

moonlightgt

what kind of coils did you buy? cheap Chinese ones can be causing misfire problems when theres a lot of moisture outside. happened to my friends ranger. used a cheap replacement and it would act up when it was damp out, once he put a motorcraft one on its been fine.