I'm still trying to get my 84 633 running properly, I have resolved several issues but still have one that I simply can not figure out. Maybe you guys could help. The car starts fine and runs okay until it gets warm, then the RPM's start to hunt between 800 and 1000 RPM then the engine starts to stumble and dies. If I punch the gas it hesitates but will normally get up to speed. If I ease into the gas it hesitates and stumbles worse. Things I've changed or checked out: Cap, rotor, plugs, and wires Thermo-time switch Temp switch Idle control system ECU main and internal fuel pumps and filter flywheel sensors Oxygen sensor Vacuum lines, boots, hoses, etc And just about everything else in the Bentley manual Any help would be greatly appreciated!!