Toyota Repair: engine 1990 Corolla, mileage cars, head gasket

Question
engine is running rough, especially after it warms up. seems like it is missing on one cylinder. It also seems like the exhaust is steamy, and smells a little rich.

Answer
Sounds like you could have a broken head gasket. Unfortunately, it's going to happen at some point with people that own high mileage cars. Does the exhaust smell kind of like sulfur? If so, pull the plugs and see which cylinder has wetness and is closest to the break in the head gasket.