Trying to nail down a problem here. When the weather gets below 20 F I get a strange power surge and a louder than normal clacky noise at about 45-50 mph and light throttle around 2000 rpm. The problem isn't there above or below these speeds or rpms and isn't there during acceleration. I sent the Edge module back for testing and an update, but this didn't solve anything. I have also noticed a decrease in fuel mileage. Usually I get around 16-17 mpg, but have been down at 13 lately. The problem goes away when the air temp is above 20F. Could this be the MAP sensor? Can the MAP sensor be cleaned? How hard is it to change a MAP sensor and where can I get a new one? Thanks for any help.