Hello, I drive the 323F BJ VI 1.6l 98hp, built in 2001 I think the ZM engine is. My problem is that the speed in a stand for 2-3 seconds drops quite far, so about 200 – 300 rpm and again rises to normal 700 rpm. The error reading at Mazda showed no errors. My workshop had cleaned the throttle valve however, which did not fix the error. What could that be? Have about a year ago air filter replaced with K&N filter but it is clean. Thanks for r all tips