Loud clunking noise from engine at idle?
First thing is to check the timing belt if it is a 4 cylinder
model. These are notorious for a slapping or clunking noise as the
belt gets a bit loose. This is esp true if the belt has been
changed as the spring loaded belt tensioner is anstalled at that
time(not used from the factory). Once again I cannot emphasize
enough that people need to buy a good Manual for their car as it
answers most of their questions.