On a 1999 Chrysler sebring would the egr valve cause car not to start?

No, a faulty EGR (Exhaust Gas Recirculation) valve is very unlikely to directly prevent a 1999 Chrysler Sebring from starting. The EGR system only affects the engine's operation *after* it's running. Its role is to reduce emissions by recirculating exhaust gases back into the intake manifold.

If your Sebring won't start, the problem is far more likely to be in the ignition system (starter motor, battery, ignition switch, etc.), the fuel system (fuel pump, fuel filter, injectors), or the engine's computer system (sensors, etc.). A completely stuck-open EGR valve *might* contribute to a rough running or hard-starting condition once the engine is running, but it won't prevent it from starting altogether.