flashing engine light with new plugs and wires

Hi guys my name is Liz, I've had my 2006 run for a year and a half. Love the car- Sunday my car started running horrible. Long story short it was a misfire on number 2. I took my car to a mechanic - not mazda i hate the dealerships- and had the plugs and wires and coils changed. Well I went to pick it up and was told the light is on and saying misfire one number 1. But runs fine. It does run fine but the light flashes when I give it gas. But only when I punch on it to give it gas. They said maybe it will reset itself. Either way I'm taking it back tomorrow. Any ideas guys? Please help.