Back pressure in Chevy Malibu?

Ksjd

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2001 Chevy Malibu. 172K

When i increase speed the car bogs forward and back. Like the cat converter is plugged or something. Could the back pressure of the exhaust being held up cause this? (Car also makes a rattle sound, poor mpg, and loss of power) Any thoughts?
Tom you have 30+ years mechanic experience and you tell me to take it to a shop?
 
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