i have a 2002 Le Mans. I have had trouble with idle, starting after a medium / long ride for a couple of years now, and the other evening it began running on one cylinder, then died all together at home that night. Flat tow to Tom Newells (Brisbane) to be advised the relays were U/S. I had swapped them around the previous night, but the trick is, ECU and Fuel Pump relays are in series, so if one is not working then none of them are working, obviously I was not jagging the right swapping combinations.
On Tom's advice, I replaced them the next morning with after market units, but will be using his recommended General Motors (Holden) sealed units when they open after New Year. Also note Bosch part number on other blogs - 0 332 207 307.
It starts first time now and have not had any embarrassing non start moments of the past, usually in front of a coffee shop full of Jappers and Harley riders
I am replacing the alternator regulator rectifier this week as well, I don't want to take that chance on the side of the road.