Engine light on codes are p300,302,304 I changed all coils and plugs notice #2 looked very bad all others were just discolored. Still have rough idle and runs rough when starting out in first gear then goes away at higher RPMs. Runs great on highway. Today engine light shut off then came back on several times.

 

I'm dealing with a similar issue. I tried everything and I'm about to replace the DME.

 

DME? definition please.