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Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.I suspect you are correct if all these codes showed up at once, if the engine starts and runs I would check to see if you have any vacuum leaks as well as check your fuel pressure (32 to 45 PSI) , it would not hurt to check for any exhaust restriction but If it is it not likely the cause of all of these codes. Post back if you need and we can work from there.