vacuum problem maybe? need help!

[morton]

on my 97 z28 i just replaced the head gaskets and put headers and a y pipe on. the car ran fine for about a week then all of the sudden it started running like shit. when i start it up it does not sound like it use to it is very flat it also seems to be miss firing while under a load in gear and when i come to a stop it wants to die on me and it back fires as well in between shifts. i have found one hose under the hood that i must have missed while putting it back together i spent hours trying to find where this hose goes and it is a vacuum line very small in dia. and looks like it has a one way blue circle valve it looks like on it about half way up the hose. the hose comes up the front left side of the motor and comes from the bottum (i coulnt find where from it c omes out of part of the wiring harness it looks like) i also do not have the 02 sensors hooked up in the collectors. does any one have any idea what may be causing this or what vacuum line i am talking about.

[morton]

nvm i figured out my mistake i have a few of the rockers to tight and it bent a push rod oppppsss

[JwMonE99]

Och, so im guessing ur motor is kinda fucked again huh?

[morton]

hope not im going to tear it back down this weekend and see if i can find anything.