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Engine Idle Surge

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Hello all,


My 2011 Ford Transit connect with 141,500 mi. has developed a strange (what I now know is called surge) at idle. My mechanic had replaced the motor mounts which made the vehicle run buttery smooth, but the issue still persists. I’ve linked a video here: https://www.youtube.com/watch?v=9t-A9ugP2-M on what it’s doing. Basically going from 750RPM, dipping slightly and then revving back up to 750-850. While it’s doing this, the van is trying to lurch forward, so I have to make sure I’m pressing hard on the brake in traffic.


My mechanic said its not so much of a rough idle (no misfire), but more of a surge. He cleaned the throttle plates, which didn’t help. I found a video online about a Ford Transit Engine Surge (found here: https://www.youtube.com/watch?v=W-vxctPicCA), but when I checked my fresh air intake tube, it was intact with no holes.


Thanks for the help!

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