Heck engine light flashing and car miss fireing

You should not be driving the car when the Check Engine light is flashing. That means way too much raw fuel is going into the exhaust system and is going to overheat and damage the catalytic converter. That is going to turn your misfire repair into a really expensive repair.

Most auto parts stores will read diagnostic fault codes for you for free, but remember, they're in the business of selling parts. Fault codes never say to replace parts or that they're bad. They only indicate the circuit or system that needs further diagnosis.

You know we can't diagnose the cause of the misfire over a computer. You have to do the testing, then we can help analyze the results. The place to start is with the common stuff like spark plugs and wires, especially if it has been a long time since they were replaced.