partial throttle sputtering/slow throttle respone

[originalsin]

ok so this went on last year but i never really did anything about it, put thew car away and just pulled it out a week ago. i want to fix the problem now.

basically what is happening is cruising in any gear giving it just enough pedal to maintain a speed it willbe ok for a bit, then it will go lean and start sputtering, if i get on the gas itll come right back out and be fine. my o2 sensor is connected and i have a narroe band gauge hooked up to it (im aware it just a light show but it gives a bit of an idea)

i chnaged the plugs today, they were very black with some area of white. im guessing the black if from when i had my o2 sensor unplugged and the white is from running lean. when im on the throttle and in boost everything is good

im thinking its either my timing,02 sensor or maybe tps? i need to calibrate my tps or at least check it to make sure its good

now the 2nd question, my car seems to have very poor throttle response, im ont he stock turbo, with intake and exhaust, i know its going to be slow either way but it just seems liek something is off. what can i check for?? (im hitting 9psi full boost)

[BEST1TUNING.COM]

You have a good idea whith checking TPS to start. See what you come up with.