Hi. I'm sorry as I'm sure this has been asked so much but I'm in a time crunch. My 2003 SS will be driving along fine and then it feels like a shudder and or drop in power and the engine shuts down. I have put in neutral and it starts just fine. The battery stays on...no warning lights...everything runs fine except it just shuts down. Mechanic removed and replaced the Mass Air Flow Sensor. said diagnostics showed P0108...PO128. So...got my car back after $700 worth of him fixing this and it was fine for one day and shut down again. This time mechanic is scratching his head and says he cannot figure out what is going on and to take it to a chevy dealer. Oh joy! Anyone have any thoughts before I take it? THANK YOU! SUSAN