What does that 10# flywheel do to the driveability of the car in stop and go traffic like cruises or traffic jams? Does it want to die between shifts or at idle? I have considered this upgrade, but didnt like the price or the possability of these bad habits rearing thier ugly head and making me dread cruising. Fuel mileage is another factor for me because I do drive it to work. One other Question, how much does the original flywheel on a 78 Z wieght and how much wieght can be taken off of a stock flywheel?