I have noticed a stumble upon starting the engine.I did a balance test by unplugging each coil. This made a difference, except on #1 cylinder. SO next I unplugged the fuel injectors and found the passenger front injector to be bad. #1 cylinder I believe.So I tested the injector with my multimeter 0 OHMS. I only have 53,000 miles on my car. Has anyone had an injector fail with so few miles? What does anyone suggest for replacements? I would hate to replace just 1 injector then have more fail.