Cadillac Repair: ROUGH IDLE, egr valve, fuel injectors

Question
I HAVE A 95 SEVILLE AND EVERTIME I STOP, THE ENGINE HAS A ROUGH IDLE,PUT IT IN NEUTRAL AND IT STOPS. ALSO WHEN I TURN THE ENGINE OFF YOU CAN SMELL GAS.IS IT THE EGR VALVE?

Answer
See if any of your fuel injectors sre leaking.

IS or HAS the CHECK ENGINE light ever illuminated while driving the vehicle and or has any other lights illuminated or any messages from the message display center ?.

What work or diagnostics of ANYKIND WHAT-SO-EVER have been performed on the vehicle trying to fix this problem ?.