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knock sensor replaced . but no luck. i think this mess coming from the air condition, but i dont know which part.

someone said this could be from bad knock sensor. right?

UPDATE :::
if i don't turn on the AC then everything would be fine.

could it be from transmission?

hi. i have mazda 3 2008.
after drive for 10-15 mintues the rpm get lagging. ( when the lag start i lost a little performance on car - when pushing the pedal the rpm goes to 4000 but after a sec...