Idle weird

2016 FORD FUSION
58,000 MILES • 2.5L • 4 CYL • 2WD • AUTOMATIC
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JARRETT.MCGINNIS
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Whenever I’m stopped at a stop light or sign it drops rpm's randomly and shakes really bad some worse then others. it also does the same thing when I put my foot on the brake to go from park to drive or reverse. It does it really bad when I drive for awhile and park it and leave it running it will drop rpm's and shake sometimes it drops so much the shake gets worse and feels like the car is going to quit running.
Jan 16, 2019 at 9:58 PM
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SCGRANTURISMO
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Hi Jarrett, my name is Alex and I will be helping you with your problem today. I have seen the throttle bores get dirty once causes a rough idle I have also seen a MAF sensor cause this. We should run the codes to sewe what comes up.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please run down this guide and report back.

Jan 17, 2019 at 3:08 AM
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STRAILER
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Hello,

If i could sneak my opinion in, this sounds like it can be a vacuum lean or the spark plugs need to be replaced. Here are two guides that can help with the problem:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

and

https://www.2carpros.com/articles/stall-at-idle

Please let us know what you find. Cheers, Ken
Jan 21, 2019 at 5:40 PM
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