idle fix

So I have a 2008 mazda 3. Basically stock except for custom exhaust. I picked up an intake off of ebay for $60 bucks. (no I wasn't expecting much for 60 bucks but it was all I could afford) A buddy of mine helped me install it and as soon as I turned the car on the CEL came on. Drove fine for a...

Hi everyone, im new to this forum. I have a 2002 mazda protege lx 2.0 L engine. at 99000kms (canada) After visiting this forum, I've replaced my EGR valve, spark plugs, plug wires, ignition coils and still no luck. It did give me a code p0300 before but its very intermittent. Its very rough...