Truck randomly has no power

My automatic 2002 Tacoma prerunner 2.4L slowly accelerates like it’s stuck in a high gear. When I try to merge onto the highway it take a very long time to reach 60mph but I notice when I turn o/d off the truck seems to run better until about 60mph. It’s not something that slowly happened over time. It’s like I hoped in it one day and it was a totally different truck. I’ve tried doing all kinds of research but I can’t find anything with problems similar to me so hopefully one of you can help!

 

Kinda sounds like a plugged up catalytic converter. Runs normal, just no power. Check the tailpipe. Have some one rev it to 3k and see if you notice lots or little exhaust coming out.

 

Will do. Thank you