and I think I feel a difference....My car is regularly driven about 8 miles a day, in stop and go traffic..... so with the $62 BMA tune up kit (plugs, filters, etc), a full tank of 93 chevron, and the 11 ounces of BG44K for $18 bucks, AND finally, running in S3 on the 55mph roads, things are clearing out.... the car does feel better..... Erik, perhaps you have a brake dragging or something? parking brake? the surge you describe is kind of weird.... good luck. let us all know! Rob sends....