well a couple weeks ago on the interstate i'm driving in traffic doing around 10-15mph and my car some how just stops accelerating. it decelerates till the engine cuts off. i have spark and all electrical parts still work. i got it towed to the dealership and they said that the ecu was bad. well after that i have tried 2 different ecu's and neither of them have fixed the problem. anyone know what could be wrong? any dsm guys around here ( newport news) wanna come take a look and give me hint? any help will be deeply appreciated.

-mike