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Hi, I have a 2005 Mazda 3 S 2.3. I bought it around 2-3 months ago with 159k miles on it. I love the car and improving everything piece by piece. Right now I have a idle issue. When warm sometimes it will idle down below 750 with shaking.

Things I done:

- Clean throttle body front and back
- Change Air Filter
- Clean Purge Valve
- Change oil to Mobile 1 Advanced Full Synthetic High Mileage 5w-20
- Changed to New ITR6F-13 NGK Spark Plugs
- Cleaned the L321 MAf Sensor first then Changed to a Denso MAF sensor
- Changed to NTK Upstream and NTK Downstream O2 Sensors

Things I seen out the ordinary was Cylinder 3 have a Ignition Coil with nothing written on it while the other ones do. Also my Purge Valve have Bosch written on it. idk if its OEM or a replacement but the only Bosch Purge Valves I seen that look like mines is for Volkswagon. I see Dorman LF66-18-74X and Dorman 911-700 Purge Valves.

Anyway, any help would be appreciated because im fairly new to Mazdas..
 

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Disconnect and reconnect the battery and let it idle for about 5 minutes. Then take it for a slow spin around the block. Should run better!
 
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