> Any suggestions, could the valves have gone so out in such a
> short period.
> One day fine, the next like running on 3 (or 2) cylinders.
I would certainly check the valve clearances next, there's a thin line
between running and not running. 1 & 3 are adjacent in the firing order, if
#1 is doing something strange like blowing exhaust back into the intake, it
might knock out #3 too. A compression check would be a good idea too, after
running the valves.
Randall
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