How much fluid do you have in the resivoir? If I remember correctly, there is a "fill line". Make sure you don't overfill it.
The cap is not a "pressure" cap. But if it's screwed up pretty badly, just stoping/accelerating will cause fluid to spill out (like when you don't tighten a 20oz bottle cap enough)
Scott
It is just overfilled. Even a minor overfill on these can cause the described problem. I have had the issue before. I notice after it went a hair below the fill line, all was well. I just kept watching it and cleaning it every fill up while I checked my fluid levels. Possible could use a new cap, but doubtful. My old 95 GT had the same issue. Same fix as well..........