Blacktop problem

[domi]

Had a similar issue. Running higher fuel pressure isn't helping, tested and failed.
The fact that it chokes on partial throttle but not on full such is what makes me think of this, but check your MAP sensor and your TPS sensor. Could be both.
For both of them the FSM has guides to do resistance checks. For the TPS, you'll need an extra hand for someone to open the throttle or hold the multimeter leads on, but it's easy. For the MAP, you'll need a vacuum gun. I borrowed one from the local parts store and did the checks. If you can get one with a very low pressure resolution it'd be best, i almost had to guess what it's at. =<
Also check that valve/tube thing that's probably between the throttle body and the MAP, it might be clogged or in other ways inoperate. If you want the easy way out - disconnect the TPS and see if that changes anything. Still not able to determine if TPS disco'd throws the ECU in safe mode, but it should change it from a bog to a slight hesitation. Disconnecting the MAP is probably a very poor idea, at that point you should be able to work with the resistance check. If you have the chance it might be better that you don't check it on the sensor, but on the ECU side of the harness instead as that would account for bad soldering/generic wiring issue.
Are you sure the vacuums are routed well [not trying to rub it in, but i thought mine were and took me months to find what was wrong with them]. I had a similar issue, although mine was immense bogdown with the throttle open too wide [including backfires out of the throttle bodies]. Ended up being PCV valve not getting vacuum, weird as hell, still makes no sense. My ECU is still recovering, but it's been making a LOT of progress over the last few days, including today being the first day it's gone without needing to disconnect the TPS so the car doesn't choke itself on startup [cheers to that, may it last long!].
I hope it helped or at least gave a hint. I'm guessing you've checked your ECU for error codes, ya? If your CEL isn't connected, i can offer a solution.
Good luck and good night!