GM-GMC: 1998 s-10 engine problems, p0300 code, cylinder misfire

Question
Hello, I am having some issues maybe you can point me in the right direction....

I have  a 1998 s-10 2wd with the 2.2 litre 4cyl. This truck has been sitting in a garage for the last 4 years not driven. When it was parked it needed a fuel pump. I just recently dropped the tank and changed the pump. Started it up and it dosent run right. Feels like it only is running on 2 cylinders or the timing is way off (all electronic w/ coil packs no distrubuter i dont think it can be timing right?)

Truck ran perfect when parked (before bad fuel pump). Only has 64000 miles. It pullled a p0300 code, random multiple cylinder misfire. I checked fuel pressure, bettween 35-45, where it should be i belive. I pulled the plugs, 1+4 are clean, 2+3 were wet with fuel. Changed plugs and coil pack for 2+3 cyl. I added sea foam to the gas and let the truck idle for an hour or so hopeing it would clear out. Still runs choppy w/ no power sounds like a lawnmower and exhaust smells extremely rich.

I am lost and before i went and pulled all the injectors and bought new ones only to find thats not the problem, i figured i would ask someone who knows! Thanks for your time and any help you can give me!

Answer
It is possible that the injectors are the problem.  If you don't want to spend the money on new ones, you can try moving them to cylinders 1 and 4.  If cyl's 2 and 3 start firing properly and plugs 1 and 4 foul, then you will know you need injectors.  Is it possible that the plug wires were reveresed or switched?
Hope this helps.