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Hey.. sorry to be kinda short... I had my 8 month old son on my lap and couldnt hardly type. It sounds to me like a bad connection with either a splug wire, coil pack.... or your alternator is going bad.
I am sure there are other things it could be too.... maybe an air leak somewhere in your intake. I would check the electronics and the air paths.... Goodluck!
It is going to run poorly on 7 cylinders, yes. So that needs to be fixed. It'll give the p0300 most likely (many scanners can't read the specific codes for which particular cylinder is missing).
Do you have the other codes? If not, I strongly suggest you invest $70 or so in a code reader and keep it in the cubby. I got mine at walmart and I've used it so many times on my and friends cars...it's well worth it.
Be sure and get one that is canbus ready.
The codes will give us clues as to what, if anything, else is wrong.