Check engine ,trac off, have lit up on dash. Truck misfiring . Ran a code check I got po303 po304 p

Truck all of a sudden started running like crap.it has very little power . Missing bad first check on code reader was po304 po705 I changed plug and coil pack in #4. Started it up for a minute it seemed to run better. Then back to mid firing . So I ran code reader again now it reading 303 and 304 still 705 . Has anyone had this

 

Switch #1 coil pack with #3.

I’d have to pull some diagrams. But there are a couple things you can check at the coil pack too.
Power feed….I don’t have diagrams handy at the moment. I will later when I get back home.
A couple hours or so…..

 

I looked at the diagrams.
At the coil there should be a White/Red wire.
With the key On. Engine Off. There should be 5v on that wire.
You can check coils 3 and 4. Just to "see" if they have power to them.

 

Ok this is crazy . I bought the truck a year ago . First thing I done was replace plugs and coil packs. Because of a studer on take off. Every one of those coil packs have gone bad one at a time with the exception of these two

 

Lucky I never throw anything away so all the old coil packs are back in the truck.

 

plugs and coils, always best to get oem. far too many issues with lower cost options at the voltages used.