Ok, so I only had time today to do 3 plugs, #5 being one of them. It definitely did nothing. I am thinking it is a fuel problem, because I checked spark and it had a good strong spark. Another thing leading me to believe it is fuel-related is that it seems to run ok in low RPMs with slow acceleration, but when I give it more than 1/4 throttle it starts running all crappy on me. I'm hoping it is something like injectors, but I'm pretty sure they aren't clogged because I have put 2 bottles of cleaner, and seafoamed it all within 10,000 miles. So, maybe this could be an excuse to buy bigger ones?
BTW, is there any way to check if an injector is faulty?