Pinging sound along with jerking
 

Ok so I have a 96 K1500 305CID with a 5 Speed NV3500. Recently my truck has had poor acceleration and a ping or a clunking sound when a take off. I had a code for random multiple misfire and replaced all plugs and wires along with intake gaskets, ignition control module, cap and rotor, and even the clutch (needed a new one anyways). The jerking continues through any speed i drive but if im in neutral and rev the engine, it sounds healthy. It seems only to jerk while its under a load (in gear). I think i hear some kind of rattle or tapping coming from the tranny. Might be a pilot bearing or something but i dont know if that would explain the poor acceleration. Keep in mind this also came out of no where. Any comments would probably be helpful. Thanks.

Not sure what type of fuel system you have, but could be fuel pressure to low.