Remember to clean around the spatk plug areas (as mentioned above), but before taking em out and replacing....so that the crud doesn't fall in the engine.
Have an 87 Corsica with something over 155K miles. Unsure, because the odometer (and speedometer

) doesn't always work.
Has the rear axle of a Beretta, replacement hood, windshield, driverside door, a tin foil and cpntact paper headlight assembly, muffler and exhaust system with more jb weld and muffler patch than metal, exhaust is held to car with 14 gauge copper ground wire, nonoperating windshield washers, rear doors leak (one is dented in about a foot), leaky head gasket, radio that is always on with bit of xacto blade wedged in the power button assembly (two blown speakers in the front are the only ones working), and that's all I can think of off the top of my head.
Got new rear brakes on it though, done the front brakes, put a new radiator in, new blower motor, thermostat, and had the wire packs for 2 & 3 cylinerds replaced, along with some suspension stuff (like in the interests of staying alive, not performance).
Oh, here's a beauty pic of the car, eh?
http://f2.pg.photos.yahoo.com/ph/psiu_glen/detail?.dir=/8d55&.dnm=f614.jpg