first off, remove the damn aiv, it's useless. There is a FAQ in here to do so, it's easy and helps. As well, it's FREE!
Secondly, with your idle, plugs, wires, o2 sensor, fuel injector cleaner, make sure your injectors aren't leaking. Some people reccomment Seafoam, it did help my 240 a bit, nothing amazing but noticeable.
for your hesistation, clean you throttle body, MAF and replace your fuel filter, that should fix that problem.
DO NOT BUY A HAYNES. waste of $$. If you buy anything, spend $70 and get the full service manual for your car. We should be able to help you online with most anything
Oh, and the PVC valve on DOHC's are a pain in the ***, don't even bother doing it.
Hope I helped
Hit me up
[email protected] if you have any other questions.
Dr.