Fuel injectors can get gummed up with dirt and fuel residue over time. Photo credit: David Traver Adolphus / Autoguide.com. Over time and miles, your car might start to slow down. It might not ...
Editor's note: This article has been changed to clarify that particulates are the emissions that can be reduced, and to remove reference to Delphi's Dynamic Skip Fire fuel-saving cylinder cut-off ...
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