Get used to it. These cars seem to always need something. I have hundreds of tools I have bought to work on my Z over the years. 5 engine pulls and ready for number 6 soon. Best advice is to fix and replace as much as possible while you can reach it. It will just be a matter of time b4 your need to anyway.Replace every hose you can reach while you have things apart. Delete the water lines, so next time it is much faster to pull the plenum. ect. Delete the EGR while you can reach it. It clogs. Replace the pressure valves under the sides off the plenum. thermostat, ect, ect. Mechanics charge a fortune to work on these because it sucks, so invest in tools instead.