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not downshifting.
Need to know the year and make, It would help answer.
cranck sunser
Answer to your question YES.Actualy a EGR valve doesn't reallystart working until you get up to higher speeds. At idel and slowerspeeds it's not active. So if something is wrong with it weatherit be EGR senser bad diaphragm orvacum hose the problem will showupat lower speeds and idle. It actually causes a vacum leak wichyou wouldn't notice at higher RPM's. It cuases your engine to run to lean making it run bad atlower RPM's. Hope this brings some light on this for ya.
Possibly a stuck or sticking EGR valve.
It depends on the gearing of the car. If you are in the highest gear and 40mph in that gear is under the idle rpm of that car than you will stall.
put a bigger carb on it.
stall at a higher airspeed.
It sounds like your engine is not getting enough fuel.
A 1998 Honda Accord could stall because it is out of gas. The car could also stall because of a bad computer.
sensor or belt
sensor or belt