The cdi was faulty on that first year model. It can cause all sorts of problems from mid range stumble to complete failure. Once a cdi starts showing signs of going bad the only option is to replace it. They still make the 87' cdi's so there isn't a supply problem, just a money problem. Shelling out a couple hundred sucks! Personally I would pass on an '87 and look for an 88-00. I am very biased toward those years not only because I own a '94 but because they had the more reliable electrical system than the '87 and a kick start the later models lose. JMO though- plenty of '87s out there goin strong.