Bad fill?
Bad fill? I got a bottle from a fill place which is a rescectable shop around here and when i put the bottle in the first time i tried spraying it i got a weird putter out of it kinda of like a boggin sensation or breaking up. then i changed the plugs and still same breaking up .that night a friend asked for the bottle i lent it to him and he went to race a car and called about five minutes later and said that he had a backfire which blew up his fast 90m intake split right across the top. he said he was way above 3000rpms and before i took the bottle out of my car i read the guage which read 1000psi. then about a week later after i got my car running right i put the same bottle in my car. the bottle had been sitting in my house kept cool and when we put it in the car it read 900psi after an hour it climbed to over 1200psi and i had the purge the bottle just to drop the pressure. i had friend come take a look at it and he said to shake the bottle upside down and put it back in. did it and calmed iot down. went out that night and raced another car hit the switch at a ridicoulsy low rpm and boom! again another back fire from the same bottle?? what the hell was wrong? 
i never turned the bottle heater on when the pressure raised above 1050 which is really weird cause all i did was take the bottle out of my house put it in my car and open the bottle no heater, yes i had no window switch but what about the guy i lent the bottle to?
If you are only getting your pressure reading from the bottle gauge i would confirm its correct with a second gauge. Heard and seen gauges break or wear out but still work just read way wrong.
