hey guys i am new to this site and am looking for a little help with my 02 x type 2.5 its only got 66,000 and recently began leaking coolant at a VERY fast rate , coolant is visuallly sitting under neath the resovoir tank and around left side and middle of hood compartment . car overheated shut off and i cooled it down added coolant and then drove it 2-3 miles home ,took it around block later and car was shaky and running poor ( throttle lag,jerky ) and also didnt crank immediatly like instead of first crank it took two .i then parked it and now wont crank , currently in process of removing intake manifolds and changing upper and lower gaskets and plugs since im in there

also obd2 machine picked up codes for misfire #3 ,cat converter,and enginecoolant temp sensor any ideas ?

thanks alot for taking the time to help
give me a shout