RPM surging

2003 PONTIAC MONTANA
190,000 MILES • 6 CYL • 2WD • AUTOMATIC
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PP270
  • MEMBER
  • 1 POST
The rpm's surge when accelerating fast between first and second and second and third gears. If you accelerate slow there is no issue. Any thoughts as to the problem?
Jan 15, 2019 at 11:39 PM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
Good afternoon,

I would suspect a possible clogged catalytic converter. The back pressure needs to be tested to verify if it is the issue.

https://www.2carpros.com/articles/engine-surges

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

Roy
Jan 16, 2019 at 1:25 AM
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