In this video, I address the running issues with my Mercedes W124, focusing on a suspected vacuum leak that is causing an ...

Vacuum leaks can quietly sabotage your engine’s performance, fuel economy, and reliability. Learning to diagnose them yourself—especially with tools like smoke machines—can save serious repair costs.

Among the many pesky issues that can confound do-it-yourself mechanics, one of the most simple yet elusive that impacts overall drivability is the common vacuum leak. This is especially true if you're ...