All of a sudden power loss

I just got this car and it was performing well when rpms 3000 and over. At lower rpms it was cutting out and only if I was on the gas to shift down or manually shift the transmission or overdrive off switch would it not cut and hesitate. So I was looking at the plug wires and noticed they had never been changed. So I got new spark plugs and wires. As I changed the plugs one was very different than the other 5. It smelled of fuel and was wet. Next was test drive and no more low rpm cutting out. So that was a victory for me. Until I was on the freeway and got on the gas and no power at all. As long as I stay light on the peddle it will operate normal but 2800-rpm and up it performs terrible as I'm on the gas and I'm looking at my tach. 3000 rps is when it starts to sound like its got a k&n air filter or no air filter. Lots of sound but being made. But power is lost. What did I do? I would rather have it cutting out like b4 I made my repairs. It was better than now. At least if I kept the rpms up it would haul and was fun to drive. Now I dont even want to pass slower cars in front of me please help.