Have a 1990 16V with only 31000 miles. A joy to drive but the gear box is "sticky" Shifts up or down into 2nd, 3rd or 4th are smooth and easy. First and reverse do not engage as easily and 5th often will not engage. It does help if I move the stick ( in neutral ) to the opposite side before shifting into 1st, 5th or reverse. Is this an adjustment issue with the gear shift itself or is there more involved? If adjustment,-- how is this done?