Miss fire on tickover and some water lost

First isolate which cylinder is misfiring by pulling off the ht lead using insulated gloves,then you can see which one is not working or making a difference,then substitute a spark plug or lead or injector to see if you can move the fault,also compression check just in case there is a compression issue.I would not go needlessly flushing your coolant as it,s definitely nothing to do with this misfire issue.

i,ve try taking the plug leads off one at a time still not tell whitch cycliner is down

Can you see any discolouration on the plugs maybe ones fouled up or darker than the others this may give a clue as to which cyl.the fault is happening.

i will get it checked tomorrow

i,ve had the spark pulgs out and number one spark plug is not working and been told it could be a valve burnt out

Do a compression test this will let you know if it,s mechanical fault.

i for got to say when you take the rad cap off it runs on all four but with it on do,nt and you can not press the bottom hose till you let the cap off

all sorted now it was a crack in the head