Hey guys need some ideas on this one. Aside from bad smog readings I get the Z hesitating, like bogging off the line when I hit it. Inconsistantly get an intake backfire too...

Z has a newer opti, new wires and plugs, ran engine cleaner and injection cleaner through it too.

any ideas appreciated

 

my car did the same thing i have a 95 lt1 engine and i thought it was the cat so i punched that it helped a little but it was still there then i checked every thing with my igniton and it was a bad coil and and ignition wire so i changed both problem fixed and now the tires just keep spining at take offs i hop i helped