The car is missing at idle and at stop light otherwise it drives smooth with a lot of power on the freeway. I check the injectors and they are all good. I check the compression and there is bad news. All cylinders read 340-360psi when hot except cylinder 3.

Cyl 3 = 150psi.

The car does not smoke, fuel burns clean ( no black smoke at idle or at speed ) and drives well. The only issue is missing at idle on occasions. It does not seem to miss at high speed. What shall I do? Keeping driving it? What is the downside of doing nothing? Or shall I overhaul the engine?

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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.