i did a head gasket on my car but before i did it the car ran with no idle issues but after i finished the head gasket job it has a hunting idle issue. but my ecu doesnt throw any codes so i dont know what sensors to change any help would be nice

 

Did you even tighten all the bolts down snug and plug in all hoses?
Did you change the intake manifold gasket after scraping off the old gasket?
Have you checked for vacuum leaks?
What are your mentionable mods to your setup?

Googling helps btw...