Your car’s performance depends on precise control of air, fuel, and spark, and vacuum leaks quietly disrupt that balance.

Replacing hoses is usually pretty easy and inexpensive, with two caveats: Make sure that both ends of the hose are accessible. Some heater hoses disappear through the firewall and under the dashboard.

A hubbub of excitement has gripped Dayco Products this year. The supplier has hit on a product that it believes will not only supercharge its own business but revolutionize how vehicles will operate ...