Thanks your right again. I cleaned plugs with contact cleaner and message has gone.
BUT remember I asked about the compressor reeds, well the compressor is working fine, when I block the pump outlet with my finger it stop the motor, I think that is normal as I rebuilt a spare one and that does the same.
When testing on the road it isa bouncing up and down as though it was on a rubber ball. The light on the dash will not stay illuminated on normal ride hieght. and when I checked the pump when I got home it was red hot.
Any Ideas