Lemme give a little explaination/story.

My FC starts fine, idles fine, but when i press the gas it hesitates at 1500RPMs. But while driving the hesitation turns into a massive bog. I've tried replacing the O2 Sensor, and TPS. I've done a tune up and oil change. The check engine light only comes on when it bogs down, but when i try to get the codes nothing comes up.

I know there is an exhaust leak, and that is next on my list of things to fix.

Otherwise i'm completely stumpt. I will try to post a Vid of what it looks/sounds like later.

 

Check and clean your grounds. Possibly re-adjust the TPS.

 

the grounds on the TPS are clean... one does seem a little loose tho.

 

There are multiple grounds for various purposes throughout the engine bay. Here's a good guide for checking and cleaning them: http://www.aaroncake.net/RX-7/grounding.htm

 

This is a good place to start, the RX-7 electrical system is like the pickiest woman ever. It must be grounded properly or will not want to work well at all.

 

if the plug on the injectors come loose it can cause similar issues. and what do you mean by "check engine" light

 

Sounds like ECU limp mode to me....
You really need to get that error code pulled from the ECU.
Ground the test terminal by your passenger headlight, and watch the engine light blink. Get the code, and tell us what it is.