My 2001 F-150 SuperCrew (4.6L Triton) is exhibiting the following behavior. Truck will occasionally stall after accelerating after a stop or during a turn. Engine stops immediately and Odometer reads "---------" all horizontal lines. If I place the truck in neutral and try to start it won't. If I turn the ignition off and back on then try to start it will. Sometimes while accelerating it will try to stall and make a comeback and you will feel it in the tranny sort of slamming into gear type of feel (by the way it is the automatic tranny with Overdrive.) And here is something else that happens if I turn the overdrive "off" using the switch on the shifter it will reengage (disengage from off ) back on it's own when the truck shudders and attempts to stall sometimes it is very subtle minor vibration as the engine is in a state of chaos. I also noted on the highway as I felt the malady about to happen again I looked down at the speedometer and at a constant 55MPH the Speedometer pegged to the right and back to the left and returned to normal. Due to the two previous observations I am thinking something of an electrical failure might be occurring the question is where? Obviously power is being lost dropping out the "off" setting on the overdrive. Although total power loss is not occurring since I see no instrument lights blinking or the radio missing a beat. I sure hope someone out there has an answer. I will be going to dealer to get the OBDII codes read maybe just maybe they will point to the root cause but somehow I am still doubtful that they will as you all know these intermittent problems can be a "bear".
Thanks in advance for any information or assistance rendered, Bob