Yes but it would have to be pretty large and lean codes would precede it illuminating CEL/MIL
YES, That would be called a vacuum leak.
Yes, that is one of many possibilities.
You should look for a vacuum leak, either in the vacuum lines or the intake manifold, also the TPS and maf can cause this if it is malfunctioning.
no, but having a vacuum leak at the power booster will. IF so, you will have to replace the booster.
I would not expect a valve cover leak to cause a car to stall. A valve cover leak can fill the spark plug area with oil which can cause rough running.
Quite possibly a vacuum leak, or problem with fuel flow. Vacuum leaks can be bad at idle and cause it to stall, a fuel problem would make it very difficult to move at all.
In short......yes
A vacuum leak can cause that.
i have a vibration in my gmc envoy when it idles and have been told that can be caused by a vacuum leak. i am currently trying to find out how to find the leak. advanced auto parts will loan you a pressure tester to try to detect the leak. i have not gotten the tester yet. would like to know where to look for it for this sort of leak before i get the tester and i am still in the process of getting that information.
All new cars are Vacuum sensitive. The Oil cap and PCV valve are part of the vaccum system. If you have a vacuum leak this could cause the car to stall out.
probably a vacuum leak
A car can idle too low because there is a leak in the vacuum. Cracks or breaks on the vacuum hoses in the cars engine could be the cause of this.