C20NE Problem need help!

[steve_8v]

i am really stuck on what this can be... the car splutters and back fires and dont seem to want to pull anywere... i have cleaned the crank sensor,checked the air flow. it did this recently before and i changed the injectors. but didnt think they would go again this quick?! its puzzled me.... it feels like its a spark but i have changed the leads andgot brand new plugs.. please help

[candy kane]

have u changed fuel filter recently?

also have u got fuel recently may be contaminated if u got it from tesco heard that alot recently