The vehicle in question is an 89 accord lx-i coupe with 5-speed. There's around 215,500 miles on it currently.
For the past week or 2, the engine seems to "stumble" after a cold start.
Normally, the engine will rev to 1800 RPM, and gradually lower the speed to 750 RPM once it has warmed up.
Now it will "stumble" around 1500 RPM, fluctuating within 50-100 RPM, with quite a bit of vibration. This only lasts for the first few minutes after the cold start. Once the engine has run for a few minutes, it manages to reach the usual 1800 RPM, and runs just fine.
Here's the story of what may have caused it. I was starting it up one morning, and i realize that my radio faceplate was locked in the glovebox. So i shut the engine back off so I can unlock the glovebox with the key. Just as I was shutting the car off, this other car came out of nowhere, speeding down the street.
Now, this caused me to flinch, and i managed to turn the key back to the "on" position just in time for the engine to start back up on its own. This is the exact moment when the "stumbling idle" first started.
I checked the ECU LED and there are no codes flashing. My only guess as to what is causing the problem is that the engine has become slightly flooded, but I don't know enough to be sure. I'm hoping you guys have other ideas as to what the problem may be.
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