Have a 00 Saphire 4x4 it has stage three chip,green injectors map sensor the lot. If you floor it,it will not take it,if you ease the pedal no problem would it be the fuel am using 95 octane

 

what do you mean by that ?

Have you changed the fuel filter recently ? If not, do so.

Have you checked the fuel pump voltage or rewired the pump? If no, do so.

 

If i put my foot to the foor it holds back like it is missing but if i ease the pedal down there is no problem.I only have this car not even 200 miles on it.I was told it was serviced but i will check the filter.
I had this problem with a previous one and if i remember it was wiring at the bulk head or a bad connection with plugs there would this be correct?

 

Check you fuel pressure reg isn't goosed.

Check the fuel filter isn't blocked.

Contact clean the engine loom multiplugs just behind the head. If they get moisture/dirt in the they can cause a missfire.

 

If after you've changed the filter and checked the fuel pump voltage (and the bulkhead connectors as said above) and the issue is still there, then see if you've still got the problem if the fuel tank is filled more than half full - sometimes the internal feed to the pump inside the tank gets blocked, meaning you'll need a new fuel tank.

 

Thanks lads will try all of the above as soon as i get the wheels back.
thanks for your help