1995 Toyota Pickup replaced engine

I replaced the engine transmission an transfercaes as well, I have put all new parts on engine from seals gaskets, plugs an wires also cap an rotor button. Also some of the plugs from the wiring harness were different from the motor that was in the truck so all the ones I changed were all the same color wires an I used butt connectors to put wires together, The only wire a connector I had problems with was the Knock sensor connector(this is the one that goes down inside the intake I think that's right).
ihave got the truck to crank an run, but it is not running very well an will shout off if u don't hit the throttle every few mins.I have also unplugged the TPS plug an it seems to run some what better, but it has no power to more the truck when it is put in gear.I have checked the fuel pressure an its good, have also reset the time by the cap an the crank marks.

Does anyone have a suggestion on what the problem might be. THANKS JASON