I have a problem with the idle everytime i hit the brake and come to a full stop the idle drops down to like 500 rpm or sometimes turns off too. the check engine lights also comes on and gave codes that where for the map sensor, running to lean, and something else. I replaced the map sensor on the intake manifold and also used carb cleaner on the vac lines to check for a leak...nothing. i dont know what else to try... HELP!!!