Originally Posted by jwfirebird
once you make sure all the vacuum lines are good, try running the engine and spraying carb cleaner around different areas. if the motor changes pitch thats your leak
For starters, I found that the vacuum lines were not correct. I fixed that, but I had used carb cleaner in the past, but it didn't change the pitch of the motor. With an application running on my laptop I could read the fuel trim produced by the O2 sensors. With the engine fully warmed up it would occasionly spit out P174 & P171 banks 1 & 2 running to lean. conclusion is that there is an air leak somewhere. When I spraided the carb cleaner under the intake manifold I couldn't hear any change in the motor, but the fuel trim was changing. Right now I have the intake manifold off and will do a clay check to see where it is leaking. I'll keep you advised what I find.