This vehicle has a rare configuration that baffles young mechanics. A combination mechanical/vacuum armature called, I believe, a "Throttle Advance," designed to prevent engine stall when the power steering is engaged.Years ago I was told that this is the ONLY model ever produced with this set up. I purchased the car new so it's definitely OEM. Am wondering if any of you older Ford mechanics are familiar with it.It sure is an eye opener to most.