Building a modified 3 liter Merc for my 25CC Fountain. Started out as an '03 EFI, and has ended up much like an X motor. Borrowed the ECU off my 300x stoker motor for initial testing, runs at least as good as expected. Simons did the stroker ECU for me a couple years back. Sent the stock EFI ECU to Simons in the meantime for a reflash. They call me when it was recieved. I can only talk to the secretary, No Eric, not the person doing the programming. They must be really busy these days. I understand that. I can only hope she gets all the particulars of what I want done. Anyway, get the ECU back late last week, $675.00 later, installed it yesterday... the motor won't start. No spark from what was a perfectly good stock ECM. A little disappointed. Can't get a call in till next week. I'l let you all know what the follow up is. I'm sure they will hook me up. Thanks.