My truck seems likes it choking!!!!!!

[northern ranger]

Hi, I have a 94 2wd 4.0 5spd and I have just had the clutch, slave, fly wheel replaced and resealed the main seal on the tranny. After it got put back together I went for a test drive and the clutch shifts great but when i push in the gas pedal it kinda chokes and stutters before getting half the power it normally has.... I got up to fourth gear and when pushing in the gas all the way to floor it didn't receive any power and it just kinda sputtered and bounced a little. What the heck could possibly be the problem? I checked and everything is put back correctly, could it be the o2 sensor on the exhaust?????? Please HELP!!!!

 

[northern ranger]

Oh and when its parked it and i give it gas it runs just fine. And if I'm driving it and baby the gas it will drive kinda okay. But it seems when i push the pedal in at any speed other then very slow it will sputter and kick with no accelerating power.