mid rpm missfire

I have a 97 GTP with 115k miles on it and the only mod is Bosch Platinum plugs. I have recently be plagued with a missfire/hessitation around 3500 rpm and above at WOT. I have replaced the plugs and wires, air filter, fuel filter, and PCV valve. Anyone else out there experienced the same? The SES light is not lighting and the thing runs as smooth as glass at part-throttle/low rpm. I'm wondering if its not the fuel pump going... any ideas?

Ditch the bosch.

Go and get some Autolite 104's (2 ranges colder then stock) or 605's (stock heat range)

They are around $1 a plug