I have a Python (1401 if I remember right) remote start. It allows for "secure idle". I think they called it "anti-grind". I had an older one of these in my blazer, unsure of the make, it also allowed for the option. Once you put the car in park, hit the start button on the control, you'll hear the relay click, pull the keys and you're good to go, engine still running. Hope this helps.