Mazda rx8 use a special tool to remove the sparkplugs?

Question edited for full 'year make model' in that order.
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Service manual in the link, but for your electrical problem, you will need a mobile auto electrician with a pro grade scan tool computer to diagnose the issue.

https://www.google.com/search?q=2004+mazda+rx8+service+manual+pdf

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Mazda RX8 RX 8 2003 2008 Repair Service Manual PDF

for the easy solution download the pdf file

You will need to have the fuel pressure monitored under a load with a special tool and also drive it for a while and see if the check engine light comes on, if it does have the system scanned and diagnose the codes received.

I am really sorry but this is way over the head of most owners, you need the factory manuals and the special training and equip to diagnose this and repair it.

Click this link directly:--- http://www.scribd.com/doc/23830753/Mazda-Rx8-Engine-Workshop-Manual ---------------- Its a downloaded format of mazda rx8 engine manual. --------------- For any more queries please keep updated.Thanks.

no special tools,just metric tools

CHANGING FRONT BRAKE PADS
Jack up the car. Take off your tire. Find the bolt on the back of the caliper and take it off. This should release the caliper, pull the caliper off the disc. Now you should be able to take the pad out. Replace the pad. You'll need a special tool to reset the caliper. As the brakes wear down, the caliper gets tighter so the brakes still work. I'm not sure exactly what its called, but you can borrow one from auto zone. Follow the instructions that come with it to reset the caliper. Slide the caliper back over the disc. If it doesn't go on, you need to reset the caliper more. Put the relese bolt back in. Put your tire back on.Drive slowly and test the brakes.
CHANGING THE REAR BRAKE PADS
The rear brakes on the rx8 are a bit different than most setups...be careful! The only way to move the piston back into the caliper is by way of a special allen head bolt that is directly behind the piston, on the back side of the caliper, installed under a 14mm bolt.
You have to remove this bolt to gain access to the allen head. As you loosen the allen head bolt(counter-clockwise), the piston will move back into the caliper.
Installation is pretty typical, again, the allen head bolt being the unusual part. The manual says to tighten this bolt until the pads contact the rotor, then loosen the bolt 1/3rd of a turn, then reinstall the 14mm bolt.

You don't need a special tool. Use a 6mm allen to remove the filter drain plug. It will probably start to spin the filter housing. You can remove the housing by hand or with a regular oil filter wrench.

u need to have the dealer fix this, u will need special tools to replace the slave and master cylinder of the clutch