why is it that when i drive my car and i hit 45 to 50 miles per hour, my car starts to shack up nd down?

1988 OLDSMOBILE DELTA 88
10,600,000 MILES • 6 CYL • FWD • AUTOMATIC
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CHRIS6911
  • MEMBER
  • 22 POSTS
I will be driving my car on the freeway and it well stat to shack up and down untill i let up off the gas. WHY?
Aug 18, 2012 at 3:47 PM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
have the transmission checked for the converter coming in and out.

have the cat converter checked for being clogged.

Roy
Aug 18, 2012 at 3:55 PM
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