Originally Posted by mazdaseniortech

you are all saying egr valve but dont forget about the intake gaskets on all the 2.0l engines are blowing at about 45k miles and suck air in at the top of the intake to head area at #2 and #3 cyndr.it will run lean and idle bad but run ok and good off idle.to cheak spray gumcutter or silicone in a can with the straw on it to the area.if it idles up its junk.only 13 bucks for the gasket at mazda but a pain in the ass to change.iv done about 30 of them way more than egr valves