Mine was doing something like that. I'd be driving along and it was rev high, then go normal, then rev high, etc. I thought it was the trans, but it wasn't. It was the EGR valve. $60 and about 30minutes of work and it was idling and running great again.
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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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