Having problems with your 1992 Mercedes-Benz Mercedes Benz 500 Class ?
Lack of power seems to be a problem with the exhaust, shaky idle
When was the last time plugs, plug wires cap/s rotor/s and coilc were replaced? I would try that first. Also you have the starting year when mercedes was told by the US to use biodegradable insulation that was "cooked" by engine compartment heat. Try buymbparts.com for engine wiring harness and lower engine wiring harness to replace them.
Repair Help & Product Troubleshooting for 1992 Mercedes-Benz Mercedes Benz 500 Class
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