You can check the EGR, but with that mileage on it I'd replace it. Its easy, and I got mine from the dealership for about $65. Mine was idling funny, the RPM's were revving up and down when driving. Replaced the EGR and it went away.
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RIP OMGGMPOWAH 04/09/04-10/29/07
2003 Mazda 6s- redfire metallic- loaded and ready for fun!
"This bitch is drunk!" -me about myself at Killbear Prov. Park '07
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