Good morning, I have a problem with my Mazda 323F 96. When driving, it suddenly jerks, as if I stopped accelerating, but then continues working properly. I've already changed air and fuel filters as well as the spark plugs, checked the injectors and the flow meter and they are alright. What might be wrong? I would appreciate any comments. Thank you.

Hi guys ,i have my mazda 323 familiar,at first it just cut off whilist im driving,later on i startrd it and had a hard crank. I then drove home. Next day in the morning i didn't start but only cranking. I took it to the mechanic and said it was a tempreture switch sensor. I replaced it but still wont start.it only start when not connected. If i connect it it wont start. Now im driving it without connected but fuel consumption is high...what could be the problem. Thanks in advance.

Petrol filter,egr,spark plug,temperature sensor checked