Car has high miles.  Started sputtering and lurching.  I changed the plugs
and Fuel filter.  Engine ran better but it won't idle.  The coolent is
continually running out but I can't find a leak.  The engine now is still
sputtering and it still won't idle.  If it was an older engine I would
think the sputtering would have to do with the fuel/air mixture, but with
the coolent problem I am afraid it is a bigger problem.  Any suggestions
or info on rebuilds?