my check engine light is blinking, my car is leaking antifreeze and misfiring.

Howdy neighbor, first thing you need to do is get a scan test performed to pinpoint the trouble! Too many possibilities for the misfire. While i agree with the first answer in part, these engines are prone to vacuum leaks @ various locations. Also possible fuel injector problem as well. This test i am talking about can't be done at a parts store, a mechanic is what you really need to do the testing! You will save money in the long run by not doing unnecesssry work and parts swaping. Have the cooling system pressure tested for any leaks. If no external leaks can be found, suggest a combustion leak test to check for the presence of CO in cooling system as well = (Head gasket problem) mechanic will know.

A blinking Engine light indicates a misfire problem, Start by installing new spark plugs and wires, as for the coolant it depends on where its leaking from..

do a visual inspection under the hood it could be something as simple as a leaky hose or fitting dripping on to your electrical system. make sure they are dry. find the leak and dry everything, and you may fix your misfire. Try that before you start throwing parts at it.

agree with all answers,have headgasket ck for leakage