My engine makes a wired grinding sound. Its like tiny gears thats are ginding its wired. When im in idle my car is at 750 rpm. But when i put it in drive its at 700 or less. Whats the deal. My engine vibrates a lot also now and the exhaust sounds alot deeper?? I just recently got the VB mod done stage 2 and its been like 3 days since. Im not sure what to make of all of this. wtf does all this mean?? Could it be my engine mounts?? could that be makein the wired noise i know they are electronic thats y i ask. what to do

 

You should check your coils