The old ones where the stock injectors, i never did them, they were the ones that took all my weight to get them out, these new ones are taking all my weight to get them in. I looked in with a flash light, really wasnt anything in there, i took a sponge and wiped it down anyway, soaked them again in gas so they would slide in easier, getting same results. but i put the motor all back together thinking maybe they were just suppose to show.. and got the same fn results where its wanting to die, but the exhaust is fd so not sure if thats the problem