changed spark plugs and a coil pack on cylinder #2 as it had a slight misfire per my OBD Scanner. after putting it all together including the upper intake manifold. upon start-up i get the engine revving up and down at normal idle, i had to disconnect alotof elect. commectors as well as egr tube into intake manifold. what is happening?
Probably a vacuum leak. Either at the intake manifold or at a rubber vacuum hose.
I think that you have a vacuum hose that you didn’t reconnect.
Go back over your work.