Transmission shifts hard

Tiny
TRELISHIEAPRINCE
  • MEMBER
  • 2006 HYUNDAI SONATA
  • 3.3L
  • V6
  • AUTOMATIC
  • 148,000 MILES
My car shifts hard and rough out of gear and also accelerates on its own when I place it into gear.
Saturday, July 1st, 2017 AT 9:50 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
Hello,

It sounds like you may have a plugged catalytic converter which messes with the MAF. Here is a guide so you can run some tests

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

Please run some tests and get back to us we are interested to see what it is.

Cheers, Ken
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Monday, July 3rd, 2017 AT 1:03 PM

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