define bad solenoids... if the wiring is done correctly, the solenoids should have no power until the window switch is closed. if the solenoids were electrically bad, they might cut in and out which might cause a lean condition, but really... what kind of idiot does not watch their shit when spraying enough gas into their motor to blow it? the solenoids could leak, but if you dont check for leaks when installing, you deserve to blow your motor. same goes for testing the condition of the solenoids. id rather do 20 quick tests and lose $20 worth of nitrous than replacing a motor because i didnt check everything. nitrous is not bad, kits are not bad. installers are bad. the wirers are bad. you always check your shit before you get all trigger happy with a nitrous kit. i guess some people just dont understand that...