1981 280zx

My 1981 280zx turbo has had the mass air flow sensor , plugs , plug wires , had the fuel injectors cleaned and had the turbo replaced, and when I punch it , it still sputters and pops , sometimes it does it during normal driving also...I can't seem to find a mechanic that can figure it out....I would appreciate any fresh ideas ..I really enjoy this car , but this tends to take the fun out of driving it...thanks

Check the fuel pressure. When was the fuel filter last replaced? Check engine light on? Any codes?

Had the fuel filter replaced also...can't check codes on that car, it's too old....thanks for responding

Sounds like a fuel delivery issue. Have you checked for vacuum leaks? Is the egr functioning properly? When it pops is it in the intake or exhaust?

It's from the intake....it acts like its not getting any gas , then it will just seem to catch and it will go fine, but when I punch it against will pop and sputter again. It is very frustrating and getting expensive as I am not a mechanic and have to pay everytime I try something..

Yes, it's frustrating and expensive but when you fix it it will be worth the trouble. I would check the fuel pressure next, that might show a problem with the fuel delivery.