So my 1999 VW New Beetle sounds like a motorcycle when you start it up and idling it sounds like a lawnmower, and that increases when you step on the gas. Any ideas on what this could be? My dad is confident he can fix it, but he doesn’t really know where to start. He’s been reading the Chilton book like crazy, nothing yet.
Edit: this is after getting over $1,000 worth of work done 4 months ago.