First, are you sure there are no vacuum leaks?
As far as the computer scan, there is no port. But rather you turn the key from off to the run position 3 times and let it in the run position (engine off). At that point the check engine light will begin flashing codes. Each code is a 2 digit number. Count the number of flashes. THere will be a slight pause between the code numbers, and a longer one when it goes to a new code.
Let me know what codes you find.
Joe
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Wednesday, September 15th, 2010 AT 7:31 AM