ok first oif all my car sometimes sounds liek its missfinig on like 3 cylinders and sumtimes it doesnt. ok so anyways. after liek 30 seconds of letting thecar idle or even driving it a loud grinding noise comes for the engine. i pushed the clutch down i hit the gas it doesnt go away until i shut the car off. wtf culd that be!!

 

Check over everything that you can see moving on the outside of the engine. My brother's del Sol actually had the A/C belt tensioner pulley grinding against the pulley mounting bracket, due to incorrect bearing/collar installation.