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[Omega6pot]

Hi, i have two 2.6 v6's and they are both giving me some trouble,
the first one will run fine and then with no indication it quits, and when trying to restart it turns over but doesnt fire up, its definately getting fuel but seemingly no spark.

The other one will start fine and go great when you kane it, its on subtle accelleration that it hesitates and it feels nearly like a miss, sometimes it will idle fine then again without warning it goes off a cylinder and back onto all of them with no interference from me, coil packs have all been checked and are fine, airflow meter has been changed and fuel pump has been checked.
Any help would be greatly appreciated
Al

[Welung666]

Do the pedal trick on them both and post up the codes (instructions in my signature below).

First one I'd say crank sensor.

Second one, when were the plugs last changed? Any oil or water in the plug wells? Any rust or splits in the underside of the coil packs?

[Omega6pot]

the code that is coming up is o2s11 on them both, the plugs on both have been changed recently and the coil packs are less than 3 months old, 

[Welung666]

the code that is coming up is o2s11 on them both, the plugs on both have been changed recently and the coil packs are less than 3 months old, 

Is that 0211?

[henryd]

the code that is coming up is o2s11 on them both, the plugs on both have been changed recently and the coil packs are less than 3 months old, 

Were the coil packs genuine vauxhall ones or aftermarket?