well first off if i bought an engine off someone and they said it runs fine, but it needs the dizzy setting up id have walked away there and then... but uve got it now so... if there is fuel and a spark it has to go bang... now.. when u turn the key to ignition can u hear the fuel pump prime? have you checked there is fuel pressure at the rail? make sure map sensor is all plugged in and working ok.... then check the spark plugs, leads, dizzy & rotor & king lead.... as i said if it has fuel and a spark generally it has to go...