Hello, i have a 2003 Mazda Familia 5 sp manual with 169,000km on it. Its being the daily car to and from town when needed (10mins each way). Recently it has started to surge changing gears and also idles around 400-500. Then it ocassionally drops to an almost stall. Ive check the ducting between the air filter and intake and put some tap around it and also cleaned the MAF sensor but havent seemed to solved the problem. Before getting a new fuel pump and filter was wondering if theres anything i could be missing. Havent being able to test the fuel pump myself. No engine codes either. Thanks