Your Connect takes off??
I obviously haven't found the button on mine where the wings come out the side...
It's not an accelerator-pedal issue is it?
Connects seem to have a tendancy to lose all power on the throttle once in a while and just tick over, but power is restored on re-starting the van. (This doesnt explain the 1500rpm bit though...)
However, when the throttle pedal died to me, no warning lights came up.
Pedals aren't the cheapest things, but are easy to change.
Im not saying this is the solution to your problem, but it might be a good start...