Possibly if it is leaking.
Would this cause the car not to start If the EGR VALVE is bad
nope
A faulty or clogged egr valve can cause an engine to run rough. If stuck or clogged the valve can be cleaned after removal with carburetor cleaner.
No Egr (exhaust gas recirculation ) is to help better fuel economy
Yes, it could.
The cost of replacing an EGR valve varies with the make, model and location of the car. An EGR valve for a 1996 Lincoln Town Car is about $160.
Check the EGR valve. It sounds like your EGR valve is staying open. An EGR valve that is open at idle will cause a car to stall. An EGR should be closed at idle and open when you are driving around.
valve guides or valve guide seals or piston rings. in colder weather?
Blocking off an EGR valve can make the car run rough. The fuel mileage can suffer as well, since the car is designed to have the EGR valve operable.
It is a common suspect in contributing to rough idle. See "Related Questions" below for more about the EGR valve, from testing to replacing.
if this is a v6, unless your car has California emissions, there is no EGR valve.
if this is a v6, unless your car has California emissions, there is no EGR valve.