First time this happened was yesterday. When I went to shut off the vehicle by turning the ignition to the off position the car stayed running as if I had not turned the key. I was hoping someone could advise if it is a back lock cylinder or just the ignition switch I should replace. I only ask because the cylinder is like $200 and the switch is $25. Hate buying both parts only to have to return one. I know I have a warn lock cylinder because I can take the key out while in the run position but that isn't a big deal to me just need to be able to shut off the engine so hoping it is just the switch. Please advise. 1978 FJ55