I'm not sure what set up you have in your '82 but I'm assuming its an inline
4.

My son had a similar bucking problem with his Jetta and it turned out to be a
tear in the boot that goes over the afm.    Every time he pulled away, the
torque reaction moved the engine and opened the tear, making the mixture
lean.  It took a while to find the problem because the tear wasnt obvious
when we took it out to check and then we dismissed it for a while.    His was
using the CIS fuel injection system, with spark knock timing, not that this
would affect the result.

Just in case,  cheers,  Steve Cotsford