Ok, so my truck sounds like a diesel because the stud for the manifold closest to the firewall is broken. It's annoying at any speed.

Is there any way to fix this without removing the manifold? Any sealants that can withstand the intense heat?

I think it also is the cause of the smell I get from running my air or heat.

 

mine did too, i've been trying to figure out how to fix it w/o pulling the motor