2007 Mazda 3 GT, Idles roughly

[bhrm]

So last week, my 3 started to idle roughly. I'm not sure if it was from the Petro gas i filled up with, because it started from then.

No CEL codes were thrown, but its so rough it shakes the car when RPMs dip below 1000.

Recently I did change my spark plugs but that was a month ago.

Any guesses?

Thanks TM3.

[TheMAN]

could be bad purge valve, dirty throttle body, or old ECU flash usually.... the typical fix is updating the ECU and cleaning the throttle body

[bhrm]

hmmmmmmmmmmmmm

Wouldn't purge valve throw a CEL code?

[bhrm]

Baahhhhhhh engine mount.