Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
It's a 1998 Chevrolet Silverado truck with the 5.0L/305 cubic inch, and I've scanned it and come back with U1192 passlock/EVO/VTD. With history codes of C0503, C0504, C472, C0495. To which I've tried everything to bypass this passlock system bull crap to no avail. Trucks symptoms before today, start then immediately stalls. Tried resetting the system with the ten minute key in on position no start, turn off for ten seconds. Did this 3 times. Then attempted to start no luck. I can put starting fluid in the intake starts the truck.
Thanks for the help in advance.