My 1999 S70 134k has a recurring little "lurch" and loss of mpg - from 27-28 down to 8 -10 mpg. I had the fuel injection serviced and cleaned but the issue still exists. Now the battery is being drained. Codes read that it is the alternator but the garage says that's not it. They're having a hard time finding "the draw." I'm the 3rd family owner of this car, bought new by my nephew, then when he wanted a truck, my brother bought it, recently sold it to me. It's been well maintained but not driven much for the past several years.
Has anyone out there had these issues, found the cause, got repaired?