I just bought a used 99 new beetle. We knew it had a bad heating core and we just finished replacing it. The car is still in safe mode, I'm getting the codes in the next couple of days. This mornohg when I went todrive it it felt like the front tires were spinning and ittermitently grabbing, resulting in a strong ehrking motion, as I went to put the clutch back in it started idling and was unresponsive, I could pull the clutch out and push it back in without giving it any gas and it wouldn't die, I could gas it and it wouldn't rev, it just sat there idling. I turned it off and back on again and it drove about 10ft and went unresponsive again. I reversed it back into its spot, starting and stopping, 10ft at a time and had someone drive me to work. What did I break? Can anyone tell me?