[wafrederick]

There is another thing to check and it involves pulling the distribitor.The vortec 350s have problems with the distribitor gear,it will run rough with a worn out distribitor gear.Look for shiney spots and most auto parts stores stock the distribtor gears.Make sure to mark the distribitor before pulling out,the timing is not adjustable and has to be set with a scan tool(0 degrees,look for the cam sensor retard)