[86 911]

A little background: I'm enrolled in Auto Shop in my highschool and overall it's a fun class. I've learned so many new things in that class from tires to engines and transmissions. Anyway, people ususally donate cars to the shop and right now, there must be about 10 cars out back in the shop from Toyotas to Fords and Jeeps (which we are all allowed to work on since they are shop-owned). There is one car that particularly caught my attention today: a 1981 Isuzu I-Mark. It's a carbuerrated, 5 speed manual, 4 door sedan. It's in OK condition. It's missing a driver's door window and inside door panel. The shifting boot is torn and the interior is kinda messy. The engine starts fine, but for some reason, if you leave your foot off the gas, the car will just go to low RPMs and die. This only happens sometimes. Other times, the engine will idle fine. The engine runs strong and the transmission feels smooth. The paint is a light brown/tan and is sun faded. Car has 153,000 miles on it. Obviously, the car needs a tune up and PPI, but the shop teacher is going to let it go for $100 (well... $95 since he owes me $5 from something I bought from him). I was thinking of fixing it up, since there really are almost NO I-Marks left out there (only 3 for sale on Autotrader in the whole U.S.), or just using it as an "uber beater" car.
What's your opinion on the Isuzu I-Mark? Are they reliable / good cars? Should I take the shop teached up on the offer for $95 for the car?