Im getting these codes on my car and im trying to trace down the problem. The car is missing extremely bad and i know the 302-303 codes are missfires, but cant find the 316 code. there are about 100 things that could make the car miss but i cant really afford or have the knowledge to swap it all out so any advice would be awesome! thanks guys.

2002 mustang 3.8L

 

P0316 Engine Misfire Detected on Startup (First 1000 Revolutions)

How many miles on the vehicle? When was the last tune up done? Did you ohm the coils and Injectors?

 

less than 90k miles on car, replaces some egr crap,plugs,wires, going to change the coils and injectors next