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Q:

While driving car started to decelerate as I pressed the gas, will not go 20mph on 1998 Mercedes-Benz SLK230

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Problem just started and check engine light blinking, won't go over 10 rpm.
(1) Answer
Hello,
The check engine light blinking is normally indicative of one or more cylinders misfiring. Since you are experiencing a loss of power, I would lean towards checking the fuel pressure at the engine. You may have a clogged fuel filter, failing fuel pump, or even a fuel leak.
This may also be an ignition issue, i.e. bad ignition coils or spark plugs, or a number of other issues.
You will need to have the vehicle diagnosed, beginning with a scan for diagnostic trouble codes and visual inspection.
You may also have a clogged catalytic converter, which prevents the engine from exhausting gases.