Problems after timing belt and water pum and all ceals replaced

Had someone a mechanic replace all my seals n my timing belt water pump etc. Car runs when the car is at a stand still check engine light flashes n car shakes alil hardly noticable lil noise from engine after he took out put everything back together again had autozone use it machine to check what is wrong code came up as misfiring change spark plugs everything is basicaly new had my transmission rebuilt 3months ago my car is a 2003honda civic ex with a 1.7vtech any ideas or clue what might be thank you