Toyota land-cruiser VX 80 Series 4.2 diesel 1994 model auto pull off on slight incline on warm day the vehicle will not accelerate fwd accelerator flat select neutral while giving it a rev select drive will start moving very slowly once revs pick up the vehical is fine particularly on hot days. the auto box has being fully overhauled and the engine. the over drive light flashes on and off switch out

If the "overdrive off" light is flashing, this indicates an error condition in the transmission ECU.

There is a diagnostics procedure you can follow, but it is a bit too long to go in to here. Try and track down a copy of the Toyota service manual, number RM315E (searching the ih8mud forums is a good start) and follow the procedure in there for reading the fault codes.

It involves bridging the diagnostics connector in the engine bay (facing the front of the vehicle with the bonnet open it is to the right of the engine on the bulkhead) - easy to do...