you've never changed your timing belt?
Umm .. that's supposed to be done @ 90K with a water pump. If that snaps, you're screwed. The timing belt will give you a horrible idle, but so will old sparkplugs. Did you get that done? You need new plugs and wires around 100K.
You're never supposed to flush your transmission fluid, only drain 3qts, fill 3 qts. When flushing, all the garbage that floats to the bottom of the tranny pan gets washed back into the gears. Not good.