Mazda RX-8 Questions

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I started the car in my driveway, moved it to the street and shut it off. 2 hours later I tried to start it and it wont start.
I have replaced battery, starter, 1 coil, spark plugs and a mid pipe which took out converter. Also replaced intake. It just turns over but won’t start
I used seafoam and run It on the interstate 200 miles I reset the check engine light it stayed off untill I restarted the engine a second time could something else be causing this code?
Drive fine yesterday. Turn key, lights are bright, no cranking.
Coded for gas cap. Changed the cap. Then radiator light came on. Drained radiator and block. Strong smell of fuel in radiator fluid. Won’t start just turning over like flooding.
I changed termistat but it still get s hot fans run water coming out of tail pipe
It will kick in once I'm on the road. I'm also hearing the blower making a louder noise. Blower issue?
At cold start rpm starts at 2000 rpm drops to 1000 rpm. A few minutes pass then rpms jump rapidly up and down between 2000 rpm and 1000 rpm over several minutes and then settles to 1000 rpm then runs/start as normal until next day cold start.
He told me the car wont start and that it needs a new $500 computer. He said he replaced the relays but didn't mention fuses. Help please!
I recently chamged out the c5ankshafy plate, did 20 stomp reset to clear the pc memory, changed plugs and wires, new oil chamged out, new anti lfreese put in after SSV removal & cleaning, still getting same codes and car will not accelerate like it has no power but revs over 2500 RPMs so I dont think its in limp mode...Can anyone help me out with possible fixes?
Drove into a puddle going between 20-25 mph, biggest mistake i did didnt see it coming. All the display lights lid up and the car began to stall from 45 mph to 30 then shut off. Ive replaced the radiator, ac condensor, wires and spark plugs. I tried to deflood the car using a technique from researching. Under tne hood, i took out the fuse to the fuel pump then try to start it but it wont crank or turn over. But when i put the fuse back in amd tried it, it turns over. Haven't tried the spark plug technique but will try it today.
The air conditioning makes it run even hotter, any ideas as to what can be causing this problem?
Changed spark plugs and wires, changed coolant temp sensor, changed fuel pump already. After it dies at idle it doesn't want to start again right away. Then once started again it sits at about 750 rpm revs up to about 1100 rpm and back down again. This is without AC running.
Was driving fine RPM dropped very low no matter how much pressure I pressed on gas car wanted to turn off at stops then catalytic converter and muffler got cherry red hot.
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