At idle you may be able to see the injector pulsing the fuel
flow. It should spray in an even cone with no large droplets
If it's pulsing on and off at RPM above idle, causing the engine
to rev up and down, you have other problems. They may include the
idle speed sensor, idle speed control motor, throttle position
sensor and/or ???
Does the Check Engine light ever come on with the engine running,
other than when you've just started it?
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