Discussion came up earlier under "85 SE Idle Problems" about a mystery jumper hose that started appearing in 1987 V-8s. The hose in (small green hose) in attached picture was not installed in 1986 (i believe) and earlier V8s. My indie was able to improve my 1985 380SE's idle by retrofitting this jumper to it. The attached picture is from my 1987 560 SL. Question for the experts is why did mercedes add this and will retrofitting it to earlier V8s help with performance?