The spark plugs . Were they pregaped or did you gap them ?
x2 check the timing
? o2 sensor , is there one . That will tell the computer its is running rich , lean .
cap or rotor , are they on right . not broken
You put spark plug wires on . Are they put on , in the fireing order . Are they all the way on , dis cap and spark plug .
Did they give you the right parts at the store , for that motor ?