Answer: Engine tune-ups should be performed every 15,000 to 20,000 miles, depending on driving conditions. Check your owner’s manual for the manufacturer’s suggested tune-up period. There are also several signs to look for that will tell you when you need a tune-up. First, if your vehicle is stalling; second, if you experience a decrease in gas mileage; or third, there is a noticeable loss in power or acceleration, you should have a tune-up performed. You should also have a tune-up performed if your “Check Engine” or “Service Engine” lights come on. Again, regular tune-ups will increase your engine’s performance and extend the life of your vehicle.