Thanks for the reply. The timing belt was changed about 50,000 miles ago and, if I remember correctly, my mechanic replaced the plugs and wires after discovering an oil leak from the valve cover was filling up the plug holes and causing a misfire. I will check the TPS, MAF sensor, and fuel pressure (if I can) this Saturday. The car's been retired from daily driving after several years of commuting but we still use her as a second car on weekends.
I'll let you know how it goes.
Tim