I have 2001 isuzu trooper. When i am hitting the gas the check engine light is flashing. what is wrong?

When your check engine light flashes, it means that the engine is having SEVERE MISFIRES!!! CAPABLE OF DAMAGING YOUR CATALYTIC CONVERTER IN AS LITTLE AS 30 SECONDS FROM THE MOMENT IT BEGAN FLASHING. Im guessing that yours has been flashing for more than 30 seconds so to begin you must find the reason why your engine is having severe misfires. THEN YOU MUST REPLACE THE CATALYTIC CONVERTER (YOUR VEHICLE IS RUNNING EXTREMELY RICH) BURNING FAR TOO MUCH FUEL AND THAT RICH MIXTURE KILLED YOUR CATALYTIC CONVERTER