Rough Idling/Service engine light flashing
 

i have a problem
i have a 2006 mazda 3 GT and it had 230,000KM on it.. ( yes i know thats alot)
and it is idling rough today all day.. it was fine yesterday.. when i am at a stop it idles rough then i step on the gas and itseems better but you can feel the car feeling like it jerking or not a smooth as before...
now could this be the gas i put in... my spark plugs.. or i just need to put fuel injector cleaner in it...

I would check the fuel filter, plugs, vacuum leaks, bad gas...

did you just put gas in recently? I have gotten gas before that had water in it and it really made my car run like crap. I had to drain it.

hey thanks i changed the spark plugs and the idleing is smooth now.. but i need to change the fuel filter cause i sometimes get a gas smell in my car... where is it and how do i change that