1st gen B16 everything stock in EF chassis, engine sometimes "surges" at 2000 rpm when I let go of the gas. IE driving on hwy then taking off ramp, engine braking in 5th, tach needle goes down to 2000 rpm then slight jerk just like I would blip the throttle, then continues decelerating. Other than that engine runs strong and smooth. No codes, O2s sensors wired correctly, new cap & rotor 7000 miles ago. Also, this does not occur all the time, only on certain occasions, but I have not found a pattern yet. ??