Hi everyone. As a recent first time MB owner this site has been a lifesaver. I have a problem with my 86 300E that seems to have come out of the blue. It starts and idles ok, but has no power and throttle response is terrible. When I floor it and hit the WOT switch it immediately runs normally, let off even slightly and its back to no power. Does anyone have any ideas or suggestions? The help is much appreciated.

Things replaced in the last 3,000 miles: air filter, fuel filter, plugs, wires, cap, rotor, (all bosch). 195,000 miles, good vacuum at 650 rpm idle. Thanks again everyone.