Spitting and sputtering

Ok this is on my truck. I had the engine out so I can reseal it and put a new oil pump in. I put a new timing chain and gear set in with an msd dist and coil. I got it started and timed right I go to rev it up and sputters and dies down if I hold throttle still but if I play with the throttle it'll rev up and smooth out. The dist has the two blue adv springs in it along with the blue stop bushing. Can anyone help me get this thing smoothed out