How to check performance?
I have a 1984 500 SEL and it doesn´t feel as powerfull as it should. At low rpms and at take off it works fine but seems sluggish at speed or slightly higher RPM:s. I will check the plugs, air filter and ignition for the basic faults but any input on trouble-shooting is appreciated.
Also I´m curious on how to check the fuel pressure (guess though that I should capture this when looking at the plugs for a rich or lean condition.
Is there any easy way to check the performance?