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I've got a 2003 Mazda 6. 2.3L. Car was running fine. Next day it was idling rough. Acting like it was going to die. So I replaced the o2 sensors, spark plugs, spark plug wires & coil pack. It started fine. Sat there for 20 minutes and no problems. Put it in gear and now it's back to the same idling issue. I did all the things the mechanic told me to. What am I not doing?
 

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Rally Racer
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The P2177 is very frequently a vacuum leak. Check everything from the air intake to the plenum. Make sure the airbox is tight, MAF tight, no cracks in accordion tube (check deep in pleats), cracks in rubber hoses, etc...
 
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