Hey guys, lost my monte . I got a 99 Buick Regal GS now. Its been running very well until recently. In overdrive, it starts to surge about 300rpms but no engine light comes on at all. It does it at 45mph(only on 45), and 65-75. It feels like it keeps locking/unlocking, and as I near 75 it does the jump like, quicker in its rhythm. At first I thought it was a misfire, so I changed my plugs/wires and made sure they weren't grounding out, and the coils look nice and new so I didn't touch them. My speedometer is jumping about 5-10mph while accelerating. So I assume the VSS is a possibility as well as vacuum lines and injectors???