okay i have a 2004 mazda rx8 automatic trans it only has 57xxx miles on it about a month ago it has been acting up i got it new igtion coils wires filter and spark plugs. this is what it does after it warm up when i am driving it: jerky and slow takeoff and when it get driven for a hour : i press gas and wont go after like five seconds it launchs and sometimes it will shut down plz people help a wounded man

 

Do you have any mods? Are you getting a CEL? If so what are they? Have you done a de-carbon cleaning? What other service has it had?

 

Compression check.

 

no mods and have not done de carbon cleaner.. how do i do it and only got check engine light... mechanic told me to reflash 6-1-06

 

I would try a can of Seafoam($8 Walmart) and add it to a half or quarter tank of gas and ring it out give it a few revs to the redline after it warms up. When I brought mine in with low compression they did a Zoom cleaning N/C. It says in the "TSB" it's covered till the 8yr-100K mile engine warranty runs out. Compression should be checked.

 

+1 on compression testing. Have it diagnosed.

 

i did three twice and seafoam do i put it in the fuel tank or the engine hose and it i put it on the engine hose do i apply seafoam when car is off and then turn it on

 

You can put it in the tank or you can follow the very helpful seafoam DIY in the DIY forum. Its a bit more involved than just "putting it in the engine hose" though.

 

Could be a CAT

 

compression check, and check the cat.

 

Look under the car after driving at night for a glowing catalytic convertor.

 

i straight piped it so there is no cat nd which way is the best to put seafoam thanks

 

If you can follow the "TSB" and use Seafoam in the place of the ZOOM cleaner. Or do like I said above..... add a can when your at a quarter tank and after it's warmed up good drive it like you stole it.

http://www.finishlineperformance.com...5-08-1883f.pdf

 

That description also sounds like when I was half full of gas on the track, and it would quit a few seconds then take off, and my 8 only had 10k miles on it.

I'm suprised that Charles from BHR didn't mention the possibility.

I put on the BHR fuel pump upgrade, and never had any more surges anywhere.