I hope I'm not missing anything here, but did you check/replace your spark plugs and wires? I had a similar uneven acceleration only at low rpms, and one night when I opened the hood in the dark, before I turned a light on, I saw one of my plug wires was arcing to the oil dipstick and block. Had I not looked in the dark, I would never had known.
Either way, if you did a tuneup, plugs and wires should be right at the top of your list.
As for the TPS, the easy way to check for correct operation is to use a scan tool or Torque for android, and just watch the throttle position reading as you slowly depress your pedal.
If you don't have a way to look at that data, then you're going to need a multimeter. I don't recall what you need to look at though, either voltage or resistance of the TPS.
