Stalls when backing up and idles very rough on 1993 Buick Century

It stalls backing up. And also idles very it could stall going forward at any time. If I press on the gas, it won't stall (but sometimes at lights...I get very anxious because I can "feel" it about to stall. This might sound weird, but it stopped during the winter when it was cold. I thought somehow it miraculously fixed itself... I know...Anyway, I've noticed it has started doing it again as it's gotten warmer. I put almost a thousand into it last Spring to "fix" it... they replaced plugs and all kinda of things- but it wouldn't stall at the mechanics... Long story short- it still does this. Other than this, the car is in very good shape, only 75,000 miles, regular tune ups, maintenace, and oil changes etc...

I took a job in Virginia (live in Indianapolis) this summer and can't afford another vehicle at the moment...and I do love my Buick. I just want to make sure it'll be reliable for another year or two.

If anyone could help, I'd really appreciate it!

Thank you!

Asked by for the 1993 Buick Century
sounds like a power issue, reverse has a higher power draw than drive does, a simple fuel filter replacement could be all it needs otherwise you may have to take it to a more reliable mechanic to diagnose it