awsomeo68

So I have a 2002 F150 Fx4 rclb with the 4.6l, 167xxx miles. I bought it at 159xxx and for about 4000 miles it ran fine after I replaced a bad coil pack. Then once i hit about 40-45ish with rpms about 1600-1700 rpms, theyll drop down to 1400-1500, when i try to accelerate, ill have to just about floor it, then the engine revs up and its fine untill i let the rpms to drop below 2000. It happens randomly too. I trie changing all the plugs, disconected the cruise control (it stoped working awhile ago) just to see if itd help.

Sorry for formating im on mole and cant find help on the issue anywhere.

Mike Gross

Do the rest of the coils, check your fuel filter and clean your injectors.

The 4.6 is a square motor and as such doesn't have much umph down low to begin with.