My 2004 Mazda Rx-8 started having problems with power/acceleration, then began low idling & sometimes stalling when I came to a stop, or pulled into a parking spot. It started hesitating when I started it, and eventually stopped starting. I had the spark plugs replaced less than 6mths ago when the engine flooded. A friend checked my ignition coils & wires, & 3 of the 4 coils were bad, but the wires were ok. I replaced all 4 coils, and the car still won't start. It cranks & almost sounds like it wants to start, or fire, & it won't. I've been told that the computer may need to be reset due to the new coils, or it could be the catalytic converter, & that the spark plugs could be fouled. Any advice would be greatly appreciated.

 

take it to the dealership and have them check the compression. Mine did the same thing, result was a new engine, all under warranty so nothing out of your pocket.

 

Just got mine back yesterday. Same symptoms = new engine.

 

Is this the same as what I helped you with??
https://www.rx8club.com/series-i-trouble-shooting-95/problems-power-acceleration-then-began-low-idling-sometimes-stalling-179989/

 

do you have new plugs too?
i had same problem.
but i changed to new plugs,coils, plug wires from BHR
boom,
problem solved k