None GM Help

[dpzelenak]

Ok heres the deal, im working on my grandpa's truck and i cant fix it and need help, ive already reached out to some dodge/truck forums so id figured id try on here and see what happens
Story Time-
The truck is a 2005 dodge Dakota with the 4.7l (not the HO one) with 105k on it.
He brought it to me saying that his MIL is one and that he took it to his buddy at advance auto and this guy said there was 3 codes, 1 for the egr valve, 1 for the tsp, and 1 for ign misfire cylinder E so he sales him and new egr and a new coil,
I replaced all the spark plugs and replaced the coil for cylinder 5 along with the egr, and took the TB off and cleaned at off real good
So 4 days go by and 225 miles and it starts misfiring again, shakin like crazy and the trans starts acting funny, shifting hard out of 1st and bucking though 2
I hook up to it and pull the codes and it for ign misfire cyl E again, so i switched the coil for cyl 5 and cyl 1(easiest to get to) to see if the problem moved, it didnt
So it was still misfiring and shaking acting funny, so while power loading it we hit the pcm, while it was acting up and it stopped and now it barely does it and mainly when its cold
So this is the part when i get lost, do i do to fix this? Ive heard that the pcm may need to be replaced but thatll be a last resort
If anyone made it this far, i thank you
and if anyone has any ideas post them up, ill try anything to fix this at this point

thanks for reading

[dsmuts]

did you clean the maf? It does sound like a new pcm would fix it if you hit it and it started working but i'm no expert.

[blueguy]

Seafoam it?

Sticky valve could cause a nasty misfire...

[dpzelenak]

seafoam is next,
i think the maf is internal, but im not sure. ill check and if its not ill clean that just to be sure

[Poil336]

my electrical teacher told me a story something like this once. a jeep was doing something a lot like this, and it turns out (kind of a common problem, too) that a contact in the pcm would heat up and expand to the point of breaking, but after cooling off, the two broken pieces would contact each other and solve the problem. basically, you could put the pcm in the freezer overnight and be ok for short drives in the morning. longshot for sure, but that would be why the pcm would have to be replaced

[dpzelenak]

well the maf is internal, and all the reading ive been doing on the dodge forums pointed me away from the seafoam, cause everyone seems to do it and it doesnt help.

poil- thats a good thought ill try something like that, but this has to be fixed today, no choice