Thanks for your reply M.B.Doc - They didn't tell me what the codes were, but did mention that it showed something with the number 4 cylinder. The indie shop owner said he didn't see how the battery change could affect a cylinder and that's why he thought it would adjust itself within a week. I will remind my wife to be "lightfooted" for the next several miles. Hopefully, your explanation is correct - the car ran perfectly before the battery was disconnected. Thanks again. BTW, any problems you know of using the Interstate battery instead of OEM?