Been having a lot problems with the boat at idle and when coming on to plane and it shutting off. It only does it when the motor gets up to operating temperature so I've narrowed it down to the module in the EST distributor.
Anyone know where to get one for a 502 EFI motor.
On top off the module it has a number 399 4G20.
Any help would be greatly appreciated!

just got 2 from Napa I think the number from napa is TP25 I'm pretty sure that's the number I will have to check in my shop tomorrow for you...Joe

Ok thanks Joe! I appreciate it

if the est timing curve is run by ECM you may be able to use a auto one, but the ones that use the EST dist as a stand alone setup, use a different module with timing curve built in....found that out the hard way a few years ago..