My ml was driven about 10 min. when it was 11 degrees below 0 when i lifted my foot from the gas peddle to slow down, engine slowed to about 1000 rpm and nothing would happened when I stepped on the gas, engine continued to run at apout 1000 rpm. Nothing I did would increase therpm. I shut off engine and then restarted it. Engine started right up and ran perfect. No indicator lights came on and no error codes. Any ideas of what happened?