I just bought a rx8 and it slow starts and burns my spark plugs quite fast. it has 58k miles . It also doesn't have a catalyst and i don't know if that is causing this issues. Ive heard that if you use Iridum spark plugs it can fix this problem.

Please help i dont know if i need to get the motor re built.

 

First, welcome...

Second, the only plugs are the ones made for it. I think they are all irridum. But, if you just got it, how do you know it uses up plugs?

Best bet is to read here. There is a lot of good data. Check out the stickies. They have great data. Sharing the year, options and other data would help. Typically, the first thing I suggest is changing coils an plugs unless you are sure they have been done recently. Oil too.

The Congrats Thread below will give you some suggestions for some work as well.

 

Hi there,i just join and looking for an aswer to my rx8.I fitted a Vipper preformance exhaust and after that a Uni chip.Now when the car is cold ,she flies like a arrow.As soon as the rx8 run on normal working temp.,half of the power dissipear and then theres a flatspot on +- 4500rpm and then you can feel there powerband as well on 6500 rpm kicks in with not much power differents.Some-one said to me that the problem is that UNI-CHIP.Can some help me in this matter please and thanx.

 

All "chips" for the RX-8 are a scam. Remove it. Read here:
Newbies Guide to Modding the RX-8: ECU Tuning

 

@ lionz, any luck?

@ harry, what he said. there is a lot going on. Most chips just lie to the computer about what is happening to make it run leaner. That is not a good thing. Pull it and see how it does. I suggest an ECU reset (20 brake stomp procedure) to flush out any chip inspired data the ECU.