Seems something was not installed correctly resulting in vacuum losses. Ensure manifolds are flush and was the manifold gasket replaced or was it cleaned?
Check the brake booster hose for leakages and proper installation.
Btw if the battery was disconnected. It results in computer memory losses and this would cause excessively low idling. When throttle body and IAC valves are dirty, air flow is restricted and the engine computer needs to relearn before the idling stabilizes. One quick way is to have the throttle body and IAC cleaned.
Excessively low idling can reduce efficiency of the brake booster if it is repeatedly used within a short time frame.
Sunday, September 8th, 2013 AT 12:39 AM