I've got a '92 5 speed manual Accord. It's been running good since I
got it two years ago. Recently, however somebody tried to sabotage
it while I was on vacation, because when I got back and started
driving it again, it started acting jerky and lurching into shifts.And
not idling properly sometimes, Sputtering or rough idle. I looked
under my hood, and found that someone had attached a pair of
needle nose pliers to one of the vacuum hoses near the firewall
so that it was pinched off. I removed it obviously, and the issue
seemed to go away. Now a few weeks later, the same problem
has manifested, but much worse this time. Any ideas what is
happening? And how to correct?

 

Welcome to forum. I've the exact same car, and I also leave it unlocked.
Unfortunately, I can't help with your mechanical tampering issue (wow); someone likely will.

 

It'll probably help if you point out which hose was pinched off (cellphone photo?) Not sure I can help - not real experienced with 1992-ish Accords.

Lurching into shifts is terminology usually used for automatic transmissions not shifting very smoothly. Maybe explain what you mean by that...