When driving over 70 MPH the engine runs rough and the car shakes

2001 LINCOLN TOWN CAR
148,235 MILES • 4.6L • V8 • 2WD • AUTOMATIC
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CHEVY__88
  • MEMBER
  • 103 POSTS
Car feels really rough, body of the car shakes. Only when I go over 70mph. I have had air ride suspension and alignment done a couple years ago.
Apr 30, 2021 at 9:02 PM
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JACOBANDNICKOLAS
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 110,190 POSTS
Hi,

The first things I recommend checking are the tires and tire balance. Have you done that? Check to see if there is anything that may indicate a belt shifted or damaged in the tire. If the tires are good, then try having the balance checked.

Let me know what you find.

Joe
May 1, 2021 at 9:16 PM
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CHEVY__88
  • MEMBER
  • 103 POSTS
I will try. The tires are about a year and a half old. It has been sitting the last 6 months or so because I was driving a company truck. Had some misfire issues before that and have replaced all coils and plugs.
May 1, 2021 at 10:12 PM
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JACOBANDNICKOLAS
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 110,190 POSTS
Check them and let me know what you find.

Take care,

Joe
May 1, 2021 at 11:21 PM