i finished putting my motor in and i went to go start it and it cranks but wont start and then when it does finally go after about 5 times turning the key it stays on for less than 3 seconds goes up to about 1000 rpms and shuts off again. everything is connected and idk what it could be. i took the battery to get tested today and it said it was a good battery. starter is good since its turning the car its getting spark all the fuses are good its definatly getting air and last night when i was trying to figure out which fuel like was the supply i turned the key and gas shot out so im assuming thats good.

any imput would be great

bad gas - fixed.
runs now but has a horrible knock like a aluminum bat hitting a rock trying to dispute getting my money back from the company i baught it from.