I"ve changed the ECm and the cam shaft sensor. the Idling control valve the upper plenum intake gasket and the car is still stalling when i come to a stoplight Please help.:mad: What is an EGR valve and what does it do. I have a 3.4 Z-34 1995 Monte Carlo.

any CEL? Does it buck and/or shudder before stalling? That would indicate a sticking torque converter lock-up solenoid.