Lately my car has been surging in lower gears and normally when i am just starting to move or cruising. usually it happens in 1st-3rd (lower rpms in 3rd). The car just jumps like for a brief moment it was getting fuel to the engine. when it happens i of course look at gauges and my a/f goes lean for a split second and back up to rich. What can cause this?? my compression numbers were 165 155 155 155 about 2 weeks ago and i have plugs gapped at 0.045. under boost the car works great although it spits oil up like a champ.