i have a couple of questions i have a 2000 monte ss it has 140,000 mile on it and i have yet to get a flush a couple of months ago it started to kind of jerk only coming out of first and second gear it dosent do it all the time just wondering if i should get a flush now and also when driving hwy speeds at 60-70 and i hit the brakes the rpms drop to almost under 1000 i didnt think that was normal anyone have a clue what that could be????????