P0300 Chevrolet -

Question

when cold I get the random misfire, seems like it goes off high idle to quick when cold

Answer 1

P0300 Random misfire

Random misfires or any misfire is a Type A code condition which means it is a catalytic damaging condition, so the ECM take action to prevent any or more damage that may occur. A  misfire that is ignition related will cause the CK ENG LT to flash.