fordtruckman2004

my 04 f150 is in bad shape when i start it and it settles down it will shake and misfire really bad also the rpms wil move up and down not to far up and down just a little....then when i get it up over forty miles an hour it shakes and has trubble going faster its bad on the hiway... i changed the plugs and coil #8 #7 #3 no change i hope its nothing to bad here are the codes it throws

po171 system too lean bank one
po300 random/multiple cylinder misfire detected
po303 cylinder 3 misfire detected
po304 cylinder 4 misfire detected
po316 engine misfire detected on startup first 1000 revolutions
po356 ignition coil f primary/secondary circuit malfunction

PLEASE HELP ME IN ANYWAY U CAN

mitchellblueis

Sounds familiar mine was on different cylinders mine was the FPCM mounted on the cross member above the spare tire you should check yours for corrosion on the back side if it is don't go cheap get one from ford hope this helps