One of the most difficult tuning problems to overcome is the seemingly ever-present engine vacuum leak. Vacuum is an important component of the internal-combustion process because it controls basic ...

It's a spinoff rule that came from trying to make racers use stock components. Engines in street cars produce a lot of vacuum in the intake manifold because they are designed to spend the majority of ...

In my 35-plus years of working on cars, I have encountered nearly every frustrating troubleshooting problem in the book. Part of the issue stems from my affinity for old Jeeps and classic cars, which ...