I would go back with solid information on the error and speak to the shop manager about the problem . He should be able and willing to fix whatever "Joe Bob" got himself into that day he thought he could do a Z32 . Then find a reliable / experienced mechanic to maintain your Z . The shop you were at may have one of the best mechanics around but he had cars lined up that day, so you got Bubba cause Bubba's never busy . I would troll the shop / Shop Manager for the Z guy , unless you have access to a reputible Z shop in your area , which are hard to come by . Either way , you have paid for parts and service so you need to collect that before you move on . The correct plugs are not cheap either .
