I think we are on the right path here.
I do not believe it is the head gasket, however it could be, or a warped head. My brother Tim was a mechanic in the muscle car era and use to race cars at National speedway, in Riverhead NY. Of course cars are different to some degree today.
We believe it is a different problem, maybe 60-70% chance, I think 90% chance. The 2003 Pontiac Aztek had a defective intake manifold gasket based on the material it was made of. I believe it was some kind of plastic. The original owner was probably not aware of the factory recall that expired. The new gasket is made of a different material.
Is it possible that the lower intake manifold gasket is allowing coolant to get into the cylinder? When I first bought the car it had excessive white smoke when starting from cold. Tim said it has some water (coolant) coming out of the tail pipe that someone said was normal, but he disagrees. The misfire shows as cylinder 2, PO302.
I saw this statement on the internet, but not sure if it pertained to my vehicle;
The coolant flows through the intake manifold to the cylinder heads to reduce engine temperature. Expansion, contraction, and heat from the engine cause the gasket to fail.
This will cause coolant passing through
the intake manifold to leak.
Maybe this is an internal leak?
Wednesday, March 29th, 2017 AT 10:24 PM