hopefully some help
Conman,
First, was your car experiencing any sort of misfire problem before you performed the KOER? If so, disconnect the #7 injector plug to see if the misfire gets worse.
If everything is running fine, I would suggest an inline fuel service that will allow the injectors to clean from the inside out. An in-tank fuel additive would probably work as well, but it would take a little time before you noticed the difference. BG enterprises offers a product called "44K" it is comprised mainly of liquid ether or something like that which clears the deposits out one layer at a time.
The A/C code is nothing to worry about, it is merely what would be referred to as a "ghost code."
The EGR code however is something that needs looking into.
Given the information you provided I would suggest checking the vacuum control lines between the EGR valve and its vacuum control solenoid. They should be easily tracable.
I hope that this helps.
95GTNut
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