I have a Mazda RX8 2005 with 138k miles on it. It usually starts like a champ on a cold start but i've noticed that lets say I go to the gas station turn off the car and put gas. After i try it start it again in about a 5 minute period it sorta struggles to start. I really dont know where to start looking to see how to fix the problem. I've also noticed that when i fill it with Premium gas it has a better chance of starting better than with that unleaded. Any ideas of where i should start?
Thanks!

 

Do you have the original motor/ignition coils?

 

Compression test after the tune.

 

Yes it's still the original engine

 

Read the new owners thread in my signature. It's a common subject. Don't just assume your engine is toast, it could be something else.

 

The car REQUIRES premium.
So that's the first place to start.

The new owners thread is the second place to continue your journey.

Hot re-start issues tend to be:

Weak ignition components (ignition coils, spark plug wires, spark plugs)
Weak Starter motor
Weak Battery
Weak Fuel pump
Weak Engine Compression

Most people who have hot re-start issues tend to find that the upgraded replacement starters are a good cure, if their engine compression is good, and their ignition system is good.

BC.