Mine does the same thing, except I've never been able to get rid of it. Checked all the sensors I could find, replaced a few, did a tune up, blah blah blah. The main problem was there was water getting into cap. Now its persistant and isnt going away. Someone told me the ECU went bad on theirs, but I havent been able to get a hold of one to check if thats my problem.
The only for sure fix I could find, is I'm putting a Chevy motor in mine.