check injection light comes on when petrol is low?

[vee]

i have changed the coils!
BUT still i have this problem!
asoon as i turn engine on i drive it for half a mile and the check injection warning comes up the car starts to loose power and act dodgy
i restart the car and it runs fine?
does any1 no why this is?

[markren2004]

possibly TDC sensor...but if your in the AA / RAC they will hook up to the computer and tell you exactly what the cause is for free.