Plugs are good. No vacuum hoses or distributor to worry about Model year 2006. Mechanic did talk about coolant issue. THAT may be my problem. Thanks for the input guys. I really appreciate it.
Ladies and Gentlemen: If I accelerate at a slow and steady pace, to "any" cruising speed and maintain that speed I can run smooth, with just a little bit of roughness every now and then forever. BUT, IF I press the accelerator too hard to maintain speed up a grade or to pass out slower moving...