RX8Club.com - codes p0301 and p0302

I have a 2004 RX8 with 104,000 miles on it. I am looking for some help on what could be wrong with it. A few months ago we fixed 1 of the rotors seals. A few weeks ago the code p0301 came up. made an appointment with the shop I take my car to. At 1 point car did lose power. Prior to my appointment to take car into shop my husband was driving car and it started smoking from bottom of car and up through ebreak. got the car into a parking lot and it died. When the tow truck came asked if we could start car and back it up a little. I was able to start the car engine light was blinking and there was a real strong smell of gas. Since the car has been at the shop the spark plugs and wires have been changed and coil. Now there is a p0302 code coming up. Mechanic said that when the car is driving it drives well but the car is misfiring. He can not figure out why this is happening. At this point he is thinking car has to go to mazda dealer. Anyone with any ideas it would be greatly appreciated.

Thank You