[Jim Kaekel]

I am having an issue with my '70 Olds E/SA stocker that is about to drive me nuts. I have an MSD distributor, box and coil. Car runs fine once it is started, but during cranking the timing is jumping all over the place, which causes it to either backfire through the carb or exhaust depending on where the timing is at that particular moment. Timing is locked-out and dead steady when the engine is running. I have checked rotor phasing, switched ignition boxes, distributors, coils, etc. to no avail. I have checked voltage at ignition box, starter, etc. and it is 10.5 volts during cranking. The only thing I haven't done is replace the batteries, which are older anyway need replacing. MSD suggested that I install a noise filter to suppress EMI (electro magnetic interference), which may be present. Ideas will be greatly appreciated.