turns over but won't start..

Sounds like A cam-position sensors or crank position sensors . You do have gas Wright ?

Tricia Tumele could be a fuel or spark issue. You changed the spark plugs but need to check the coils as well. Remember that the 04/04 RX 8 had a TPB about using different plugs then listed in the manual. Make sure your replacement reflects that. It also is having chronic issues with flooding which can get the catalytic converter to clog and fail. Have that checked too. As for possible fuel issues you need to check the relay, the fuses, and the pump itself. This is a great car but needs a lot of personal attention. Here is the troubleshooting guide from the manual which may help out. It’s a ‘05 which works for the ‘04 as well. 2005 RX8 EngineProblem

Clutch sensor it's your problem

Primero podría estar inundado, sácale los spark plugs, quita el relay de la bomba de gasolina y haz como si fuera a prenderlo, limpia los spark plugs y se lo pones, y pones el relay de la bomba de la gasolina, verifica los coil de los spark plugs, pudiera no mandar chispa, pues no hace ignición a la mezcla de gasolina y aire, podría ser dos alternativas

Aside from what has been talked about above, you might want to consider a clogged fuel filter. If it hasn't been changed, and is relatively easy to access, it's a good maintenance item to replace anyway at 95K miles, IMO. A fuel starved engine will run lean, and therefore will run hotter, so you might smell that this is happening, as you sort of described. It will also hiccup a bit.

If it's spark related, then it could very well be the CKP, aka the crank position sensor. That said, these are usually a real bear to get to for the unseasoned mechanic in particular. With many cars easiest access to potentially failed part can be a prime determinant in how one goes about fixing things. Good luck with your Mazda.

This car is a rotary, which means you should ignore advice from anyone who doesn’t acknowledge that first.

The RX-8 has an annoying habit of flooding if it is started and shut down before warming up. My RX-8 is sitting in my driveway with this exact problem right now. I suggest investing in a battery charger, as it is a good thing to have with this car. Search YouTube for “RX-8 de flood procedure” there are probably a dozen videos on the subject