what could it be when it b a rattle noise coming from underneath the car? on 1994 Chevrolet Caprice

one person told me that it could be the fly wheel and one person said it could be heat shield..

Asked by for the 1994 Chevrolet Caprice
possibly heat shield on converter. does it sound tinny?
1 more answer , 1 more comment
Hello as already stated it could be a heat shield or converter another possibility is cracked flywheel or loose torque converter bolts does the noise change when putting in gear if so i would check these

North Ga Auto Repair
it only makes the noise when it is in park and i had a guy to check it and he said it sound like the flywheel.. thanks for your reply.