03 Lesabre gears not changing in park or gas peddle non responsive
 

I had the plenum and upper intake changed out about a month ago because there was antifreeze in the throttle body. Engine was running a little rough so I changed out the spark plugs and have been running premium gas with the addition of dry gas for about a month . Rough idle is now corrected. Today though I drove the car for about 5 mins , than parked for 20 mins and came back to start it and it did start , but the when I put it in drive , it didn't do anything. Wasn't engaging even thought I could move between park, drive etc. Than I pressed on the gas peddle and no response at all, also the break wouldn't depress. I turned the car off and back on , than the break depressed, everything worked fine. I should mention that it's 9 degrees out in MI today. ANy ideas?