The other day i was driving to work and all of a sudden my truck got a horrible skip and my ses light was blinking. So i done the basics, replace my plugs and boots and added some seafoam to my gas. but yet the problem continues. I have seen posts with similar problems but nothing exactly the same and if i found one close i didnt see the resolution. It only skips between 1400 and 2500 rpm and my power has decreased drastically. It isnt smoking or anything and the skip comes and goes when it wants. I also checked the coil wires and injector wires, and changed the number 5 coil. still no luck. Any help or suggestions would be great, thanks. Also its a 97 f150 5.4l.

*Also it doesnt skip until the motor heats up, it usually takes about 4 to 5 minutes for it to start.

 

Try swapping injectors and see if the problem moves. Wouldn't hurt to do a compression test as well.

 

the seafoam actually done the trick, thanks for the help tho.