So i have an 1982 berlinetta camaro. 305 coverted to 350 turbo...automatic.
Just yesterday she started to not change gears unless it is red lined/ floored an than will go in to second and will do the same there in second
Diwn shifts properly .
Any idea?

 

Vacuum modulator.

Or, maybe just the vacuum line that goes to it.

 

Ahhh thank you sir that worked perfectly...and actually has a little more torque...
My dad was proud.
"You have been a boy"
Lol