Soooo, i just purchased a 1979 280e. The car starts up fine but idles really high, it doesn't seem to go down after it warmed up. Could this be the aux air valve? i have not checked the timing which i will do tomorrow. i checked for vacuum leaks and the throttle linkage as well. the car also smells pretty bad of gas but there is also a huge exhaust leak! will a stuck air aux cause such a high idle? the car doesn't have a tach but im guessing its around 2500rpm. Any advice would help at this point. Thanks!