Huge Loss Of Power at WOT....

[TEALBST]

Hey guys Im new here so I hope this is the right place for this. I have a 1993 GT with the modes listed in my sig. Lately I have noticed a huge loss in power at WOT! It does it most of the time, but if I start out slow and roll into it real hard it does alright until about third gear at 4,000 rpm. Thats when it feels like I just hit a brick wall. I just put new plugs and wires on two days ago. The gap is set at .054 and all the wires are good and connected. Ive seen the thread about fuel pressure and I adjusted mine from 40 psi to about 38 psi. I drive the car everyday about 30 miles round trip. I have also noticed a slight drop in fuel mileage. Today on the way home I got on the gas real hard and in 1st and 2nd it felt real strong, but in third I ran into that same brick wall, so I let off the gas and jumped right back on it and the car bogged heavily and then gained some power, but not all of it! The timing is set at 12 deg. I would greatly appreciate any help you guys could give me. Im looking to take the car and have a dyno tune, but I dont want to waste my money if I know the car is not at full potential. Please help fix this gremlin!!