I would say poor compression, on at least one cylinder.
Does it crank over evenly if you do so with the wire off the injector pump so that it wont start? A worth while simple test, as one, or two cylinders down on compression sill be very apparent as it cranks. You hear the weak cylinder 'skip' as it cranks. If it cranlks nice and even, ie all 6 compressions 'sound' the same, it probably aint that. if it's at all un-even, it's worth going to the aggro of a proper compression test.
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"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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