The check engine light never actually stayed on. It flashed during the rough start but that was only about 2 seconds till I turned off the truck. It hasnt come on at all for the month I have owned the truck. The truck has started perfectly ever since.
Looking to get rid of the chirpping sound that appears every 4th day or sowhen I start it up and disappears when after I drive away.
Will try battery and belt.

What type of battery are people using aside from the BMW dealer battery?