No
I had a similar problem and ended up replacing both the lines and the radiator.
You can do that by replacing the tensioner
With a transmission linkage bushing (specific to your car)
No.
The 1991 Chevrolet Cavalier transmission linkage can be tighten by turning the adjustment nuts. You will find the adjustment nut on each end of the linkage.
You don't tighten a serpentine belt. The tension is controlled by a tensioner. If it is loose, then the belt has stretched and needs replacing.
I think you will find that the lifters are hydraulic which means they are non adjustable. They either need replacing or the rockers need replacing.
Nothing good. Tighten the bolts and this becomes a mute issue.
There is no manual band adjustment in that transmission. It is self adjusting.
You do not tighten a serpentine belt. It has a tensioner that keeps it at the correct tension. If it is loose, either the belt is worn and needs replacing or the tensioner is defective.
It has a serpentine belt with a built in tensioner. You can't tighten it. If it is loose, it needs replacing or the idler pulley is defective, or both.
You don't tighten it. It has an idler pulley that keeps the proper tension. If this is an old belt and is loose, then it needs replacing. If you have installed a new belt and it is loose, then either you installed the wrong belt or the idler spring is weak and the idler needs replacing.