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Would think if the cat was bad there would be a code thrown. With no codes and lacking power post tuneup, would not know where to start other than to try to capture live data while driving the car to see if anything shows up to give an indication what is going on.

Transmissions on these cars are supposed to be drained and fluid changed, pretty sure it was suggested to not flush them.
 

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"I am also getting a pop sound when I accelerate sometimes."
Dose it rattle on start-up? If so possible stretched timing chain.
 
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