My car is still surging but only during warm up. I usually have to restart 3 times to get it to stop surging. Other than that the car drives well and everything is ok. I wonder if there is a vacuum leak anywhere? Does anyone know what hoses I should check in order to find a vacuum leak? The air intake hose is brand new and i checked the pcv hose and found no leaks? Any others? There is a slight/ soft hissing sound on the back side of the passenger side of the engine but I might be hearing things so im not sure. Also I did not change the TB gasket after changing the TB. Could there be a leak there? The TB gasket looked fine. Basically Im trying to avoid going the 150 dollar diagnostics fee that mazda is proposing to charge me!