My car is lacking at 4500-5000 rpm
 

How’re you doing, I recently moved here from Texas and I bought an rx8 there and had the engine rebuilt there and moved down here to Florida. I have a problem where as I accelerate my power stroke stops near 4500-5000 rpm I changed the SSV and the 2 vacuum solenoid and that still didn’t fix the problem I also removed the car and check to see if it was clogged. Any idea would be great.

Also If anyone knows any good rotary mechanics in Fl that’d be great.

Petitt Racing are one of THE rotary mechanics and are in Florida.
Who did the rebuild?

Are there any other issues or just this? I would check if the fuel injectors are correctly wired, but if that were the problem (which isn't uncommon after an engine change), you would gave other symptoms.

Does it happen every time or is it a random occurrence?

I did it at some place called rotary shop in Texas, but everytime I get to those high rpm areas I hear pops from the exhaust

And this happens every time I drive

I recently had my engine replaced after 3 years and the mechanic experienced stuttering going uphill.
It needed a new fuel pump.

In my experience the fuel pump failure isn't that consistent, but it might be worth checking the pressure.
I went through 3 pumps in 10 years.

No CELs or codes?

Air - clean MAF? No obstructions?
Fuel - good fuel pressure under load (58psi)?
ignition - new coils and plugs? Strong battery and alternator?
Exhaust - no catalytic converter clogs?

I had hesitation at high RPM and it turned out to be clogged cat. Easiest way to check is pull out o2 sensor and look with endoscope.