Acceleration smoking


2003.5 mazda protege
Im outta ideas here. No loss of power no smoking on start up or idle. No smoking under light to moderate driving. Over 4500rpm its like the engine caught on fire bad drop rpm and smokes gone.

Before this started happening i changed pcv valve and oil got changed to different brand. Swaped old pcv valve back in and continued could it be from the brand of oil or what. I have almost not oil consumption and radiator fluid is fine afr hasnt changed either so kinda stumped. Maybe valve seal wearing out?