Alright I thought it was just the rockers but I got them all tightened down and I still have it. I only have it at higher rpm and when I let off the gas for a few seconds. I have no idea what else it could be. Any ideas?

 

Well 97 views and no opinions... ok. I'm pretty sure it's a lifter (not sure if it's just stuck or what) 2 questions.
1. Can I replace one set of lifters at a time or do I need to change all 12 at once?
2. Is there a way to replace my lifters without taking the head apart?

 

Have you checked the exhaust system for holes, cracks, etc?

You don't have to disassemble the heads but you may have to remove them to get the lifters out.

I would replace them all if you are going to replace one. That way you know you actually replaced the bad one.

 

No. Havent had anyone suggest that. I've tightened my rockers down already and it didn't help much so I didn't know if I should check lifters next or what. No one has ever said exhaust.

 

Look closely at the p/s header. they are prone to cracking on the new edge cars.

 

I think it is. I have a spot by the elbow on the passenger side right under my O2 sensor that is pitch black. Can't check if it's cracked or I have a bad gasket until I get it on a lift though. Can't get enough room to see it with just a floor jack.