I was driving home the other night and out of no where my xterra lost power and i had to floor it to get any power out of it . i drove it like that for about a half mile and parked. Now it wont start. wondering if its really flooded. checked the distributor and everything seems fine. plugs are looking good and have good spark. Had it hooked up to a diagnostics test and the first cylinder is mifiring. we pinched a gas line off and it tried to start but died. And when u turn the key on there is this buzzing noise and im not sure if its under the vehicle or on the back of the motor.