usually you should run seafoam before you put new plugs in, not after. try a new set of plugs and check the coils. check the air filter and fuel filter while your at it, and get some carb cleaner and spray down the IAC for ****s and giggles.
btw what plugs did you get? on a whim i got some bosch ones out of pure ignorance and stupidity and it ran like poo, idled like i had huge cams, but had the throttle response of a 1.6L civic with a 60trim turbo, but with no turbo up top, and no vtec either. came on here and got NGK TR6 plugs and blammo, runs uber smooth.