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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.
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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.
Find Out Why Your Check Engine Light Is On
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