Q: 08 Hyundai, 92000 miles, replaced catalytic converter now check engine light is on and van does not accelerate for about 30 mins w

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Already had catalytic converter replaced but heck engine light is on and van does not accelerate and it's hard to press on the brakes. It only does this when I first start the van for about 15-20 mins. The engine light does not flash it stays on. The exhaust burned by nose in passing while the van was warming up. I've paid 1 mechanic $75 to diagnose they said $150 for tune up but it could also be some other stuff. I don't want to pay for trial and error repairs, too expensive.

My car has 92000 miles.
My car has an automatic transmission.

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