I have ck all the plugs pass side third one back a little loose thought i might find some loose on the d-side no such luck. I think you might be right about the headers but i have had other cars with headers that leaked and this just does not sound like a header leak. those are such a b-t-h to take off and look at the gaskets i want to be sure before i get back into that job.
Thanks to everyone who wrote back anyone know a sure fire way to ck for a header leak