If it's a miss, my bet is bad injectors.
Are yours originals?
Replacement injectors, a lot depends on how much you want to spend.
I DO NOT recommend replacement originals, nor will anyone else here.
The original Multecs were not designed for gas with ethanol and there an internal seal that degrades quickly and eventually shorts the coils. Interestingly enough, the originals are the most expensive by far of all of your choices.
Your three choices most common choices by price are:
RC Engineering
Accell
MSD's from FIC.
Gaskets.
All you will need is a set of plenum gaskets, get 'em here at Jerry's:
http://jerrysgaskets.com
Jerry is a member here and a GREAT guy, and his stuff is the BEST.
Pulling the plenum is fairly easy if you're reasonably handy. There's LOTS of pics and info available here on the forum, just do a search on plenum pull.
Good luck!!
TomC
"Crabs"