Inspect and replace your engine air filter. Just unscrew or unclip the air filter box retainers and remove the old filter. Then hold a shop light behind the filter to see how much light passes through. If the filter blocks 50 percent of more of the light, replace the filter. If not, put it back in, secure the air filter box cover and keep driving. Get the full step-by-step on changing your air filter here. It’s one of the easier things you can do to fix up cars.
Many people can do common household repairs. There are resources on the Internet, as well as do-it-yourself guide books, with instructions about how to complete a wide range of projects. Sometimes the fix-it skill is seen as genetic, and people lacking such skills are said to "lack the handy-man gene". One trend is that fewer homeowners are inclined to do fix-up jobs, perhaps because of time constraints, perhaps because of lack of interest; one reporter commented "my family's fix-it gene petered out before it reached my generation."
If you can see light creeping beneath exterior doors, air is also escaping. Grab a few packages of self-adhesive rubber foam weatherstripping and go to town, sealing any and all doors that lead outside. Weatherstripping already installed but you’re still suffering from a high gas bill? It might be time to replace the strips installed by the previous owners. Check out this handy tutorial on installing weatherstripping.