ok here's my problem It just started last week after bringing the car to the shop to fix a rear brake line, I don't think the problem has anything to do with the repair. The car was driving and running great all scan #brs right on the money and the car is in good health and tune. After bringing it in to fix a driverside brakeline maby a day later the car started running sluggish, by this I mean spurting/ surging while driving almost like it's missing, stalling at idle, some backfiring at cruise, the cause is unknown to me. I did notice the volt light /alternater dummy light has also been coming on spuratically. I did throw a belt about a month ago, the alternator pully had come loose and threw the belt while I was driving home from the states. could the alternator be damaged causing the problem??? My scanmaster # is about 13.4 - 13.7 on the volts if i remember before it was 14.2 not sure tho... my original thought was it might be a coil pack but like I said not sure. plugs are relativally new sisnce i changed the motor this summer wires are a bit older but in good health. all grounds seem ok but havent checked for wiring under the car yet. any suggestions please let me know thanks all....