Hey guys im new at this hope you can help i was driving all was good and then a lifter colapst i changed every thing all new parts i get the car runnin great drive down town all great go to shut it down turn the key off and nothing happend i mean the motor just keep runnung like the key was never turned

My car does this when I get bad gas in it. What octane and brand are you using? Mine only does it, when I use walmart gas. I switched to shell, and it stopped. A 81 ford 1 ton we have used to do, when we didnt run unlead plus in it.