MR2 Spyder Test Drive

I finish a couple of last things to be able to take the MR2 Spyder for a test drive, the rear sway bar and rear body supports. I find a vacuum leak which seems to take care of the random misfire but then after the test drive I have some new issues. The car has a random and #1 cylinder misfire and now a fluctuating idle once the car is warm. Love any thoughts on the cause of the idle fluctuations or misfires.