If it runs, leave it alone and drive it.
The 2.2l will knock, they all did. Wrist pins. But it won't be a problem, just an annoyance.
Go thru the battery cables, you'll likely need to replace both. They're probably green with rot.
Keep a map sensor handy, and check the potting in the ECU/PCM. Seen a lot of them get cracks in the potting and allow water to short the electronics. You'll know if the potting is bad if you're driving on a rainy day and the car just shuts down on you.
I'd love to have another one of those things. I miss those 2.2L engines.
