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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.The code P0400 indicates you have an EGR flow concern and if the EGR is flowing when it should not be it can cause a lean condition which can cause the engine misfire codes your getting. Before you do anything lets try disconnecting the EGR valve and see if the engine runs better. Check this for me and post back with the results and we can work from there.
The code P0302 indicates an engine misfire on the #2 cylinder. Since you have replaced the spark plugs is the engine still misfiring?
Did you ever try disconnecting the EGR so it can not flow and see if it ran any better?
Okay well then Im out of ideas and I dont think I can fix it from here. I will open the post back up for you and perhaps someone has something different to offer.
Hi,so #1-4misfires did not return and the only code present at this time is a #2 misfire
how does it run off idle
I know you said the coil was replaced but was it with a factory one