i recently replaced my air blend door motor,reconnected battery,car won't start on 1999 Mercedes-Benz ML320

disconnected the battery to work on my air blend door motor,reconnected battery and car will start but won't stay on for more than 3 seconds.restarted will crank,turn over and rough idle and cuts off.what could be wrong and what is the solution.pls help.thanks

Asked by for the 1999 Mercedes-Benz ML320
1 answer 1 comment
sounds like you left something unplugged under dash recheck your work and look for unplugged connector or one that is not plugged in all the way
thanks for the help,i double checked everything and they were intact so i just have it towed to the dealer,have the keys programmed and they found that the mass flow sensor was also at fault so had it replaced.by the way my ac blows cold and my heater gets hot in a flash.