Resetting your computer is a simple task. You can either remove your "ECM" fuse for 10 second's or disconnect your negetive battery cable for the same amount of time.
As to the roughness of your engine and unexplained reving, it seem's that your computer is seeking data. This can be caused by many thing's. The most common of which is low alternator output. Hase this been checked? Secondly your timing default plug my have accidently became grounded. This is a plug near your ignition module that seem's to be unplugged. There is supposed to be a cap on it, but sometime's it is missing, if it is missing, clean the connector and cover it with tape to prevent future problem's. Thirdly, check to make sure that your air intake tube is secure and sealed, if it leak's the Mass air sensor get's a bad signal.
Your dealer is probably incorrect about the missing data plug. I'll bet that if you or they look closer it will be found.
I hope that this help's
When in doubt :DON'T
Valley Station, Kentucky
Dream EXPression Racing