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Replace Engine Air Filter
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% 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.
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Replace Your PCV Valve
The positive crankcase ventilation valve (PCV) regulates the flow of flammable crankcase vapors back into the engine so they can be burned safely. The valve is designed to close in the event of an engine backfire to prevent catastrophic engine damage. As they age, the PCV valve accumulates carbon buildup and the spring loses tension, putting your engine at risk. Refer to your car's maintenance guide for recommended replacement intervals. Most PCV valves can be replaced simply by wiggling the valve out of the rubber grommet and disconnecting it from the vacuum hose. Then insert the new valve and reinstall. It's that simple. Click here to get the full scoop on whether or not you need to replace your PCV valve.