Found a local mechanic that works on MB, BMW, and Xfires. He put my 2005 SRT 6 on a scope and ruled out the cam & crank sensors that he says are working. He said it is a fuel problem and he will need to keep the vehicle and test it when the problem occurs. He believes it is the fuel pump that doesn't properly prime the fuel line before start up causing the problem. He says there are 2 different fuel pumps for this vehicle. Does anyone know which one applies for my 2005 SRT 6?