I'm trying to determine a
problem that I currently have with a my 2007 4X4 Frontier
that seems to be electronic caused.   This is the second
time this has occurred within a week.  With no warning my
truck wouldn't start.  I started the truck by removing the
starter relay and jumping it directly from the battery
with the ignition key in the on position.  Truck started
fine with normal idle.  The next problem was realized with
driving forward in the normal drive "D" gear position. 
The truck would barely move. The over-drive light on the
dash flickers.  Seems like driving slow due to very little
torque applied to the transmission.    I think there is an
electronic relay/switch that needs to be replaced.

Anyone even had and resolved thee
problems?