Wouldn't be too noticeable of problem normally ...but, we were volunteers with the US Forest Service and lived on top of a Georgia mountain. There were times where it didn't feel like the poor chirping, wheezing, anemic thing would make it to the top. Old ladies in mini-vans were passing us and giving us the central digit. It went like a Banshee on the way down, though. We thought that the V8 with Advance Trac etc. would laugh at a mountain road. Not quite.

Internet indicated that it was a common problem with Ford cam positioner. Clearly must be a user fault.