While driving car started to decelerate as I pressed the gas, will not go 20mph

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.