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Between 1,000 and 2,000 RPMs my car violently shudders in any gear whether it is parked or driving

Tiny
COPRET19
  • MEMBER
  • 1995 FORD THUNDERBIRD
  • 4.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 262,890 MILES
It sounds like a misfire, but the engine runs smoothly otherwise. I had a technician look at it, he said it could be a vacuum leak on the engine. So, I then I replaced all main vacuum hoses, but didn't fix the issue. Another tech told me it could be the Auto Transmission vacuum modulator but I'm not sure. I am just wondering if anyone on here has ever run into similar problems with their car listed above LX model.
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Tuesday, June 14th, 2022 AT 6:49 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,690 POSTS
It sounds more like a mixture problem, have you replaced the spark plug? I would remove the plugs and see what they look like, either black or light tan. Also, if you can take a quick video of what the engine is doing it would help us fix it. These guides can help us get started. You can upload the video here in your response.

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

and

https://www.2carpros.com/articles/how-to-change-spark-plugs

Please run down these guides and report back.
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Wednesday, June 15th, 2022 AT 10:48 AM

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