Check engine blinks once when gas is pressed. What can be wrong? How do I fix it

Possible air intake leak. Check all intake hoses with carb. cleaner while engine is running to see if engine 'surges' for location of leak. Also, possible gasket leak in the air intake system.

don't drive it with the check engine light blinking!po300 is code for random multiple cylinder misfire.don;t know which engine you have.google po300 engine code.could be fuel pressure or a number of other things.i am guessing you have the 4.3L?