Vacuum Leaks galore...Check your connections by spraying Gum Out Carb Cleaner on them...Look for change in idle and check that all connections are tight...Good way to check is to replace stock hose with new silicone hose or just newer stock hose...use clamps...Use care...Use a manual...These are machines that require effort to get working 100%...People can turn wrenches all they want, but you have to understand what youre' doing and what cause and effect can happen when something is adjusted wrong or right...It comes with experience and hands-on work...Idle problems can be too many things but your description leads me to beileve its a vacuum leak close to the intake manifold/tb/brake booster

Zee