I have a 99 Venture that misses on cyl 4 (P0300 - datastream indicates cyl 4) 45-50-60 mph, 1/2 - 3/4 throttle, cant get it to miss regularly in a shop stall. It can go for days with no symptoms. I have tried Delco plugs, wires, module, coil pack - no change. ... Login to read more.