valve clearance? my car wants to die

[banky]

hey, i just finished a mission with my father. we changed out my pistons with pistons from another block we got at the local u-pick.. anyway, everythings put back and the car turns out for a few seconds then just dies. or it idles at 2000 rpms.. we lowered the idle and now it just does the former. my dad thinks it could be the valce clearance, because we dont exactly have the proper tools for that, but he rigged up something, just not sure what. anyway, he wants to know what happens when the valve clearance doesnt meet factory specs, does this problem occur? my check engine light doesnt turn on when the car starts, so i dont think theres an electrical problem. but when the car starts, if you keep revving, it'll stay alive and rev all it wants, it just dies if you dont keep giving it gas. anyway, any help would be greatly appreciated. thanks.

BTW: its a 92 S13, we got the block and the head from a 92 also. we used the new head, with the old block because the new block was from an auto 240. so we used the new pistons in the old block with the new head. sorry if any confusion.

banky