need help

i got a 96 cavalier 2.2l about two weeks ago i had a blown headgasket. i fix it bouht new gasket. and put everything back together. the runs well better then before. but when the car is idling and i push the gas a loud clciking nosie comes from around the belt. it does not do it when i am driving . what can this be???? (my belt was a b@#$ to get on and it fell in some coolent and oil could have gotten on it) also could this be a loss rocker arm??? please help me :banghead: :banghead: :banghead: :banghead: :banghead: :banghead: :banghead: