Speed is stuck wide open. I can disconnect the foot pedal and speed is still wide open. Any suggestions, thank you so much, this will make a preacher curse

I believe this machine can operate without the foot pedal attached. Disconnect the foot pedal and try using Start/Stop button. If same symptoms with pedal detached then likely problem is speed control module inside machine.

I would suggest you replace the foot pedal speed control.

Best guess is replace the throttle cable.

If you can get inside the rheostat and move the wiper arm to properly wipe across the resistance then................

But often there is no getting inside and the only thing you can do is to replace the rheostat itself.

Check to see if there is something caught up in the foot pedal, like a scrap of fabric. That could be enough to prevent you from fully closing the pedal. Disconnect the pedal from the machine and from the wall. Holding the pedal in your hands, squeeze it closed as far as you can. Release. It should pop open. If it does not, then the pedal springs may be broken or worn out.

if your saying your saw runs full speed as soon as it starts , one of two things is happening :
(1) your low speed carb jet is too far open
(2) your throttle trigger has disconnected or become stuck from your carburetor and now the throttle blade inside carb is full open

not being informed if it is auto or manual, here are some of the items that control the cruise control
brake pedal sensor ,
clutch pedal sensor,
vehicle speed sensor
engine ignition control module , tacho ,
vehicle speed --will disconnect if the road speed is below setting minimum speed
ratio changing
bad cruise control switch
wiring and connections
ecm problems
problem cruise control module

maf sensor or fuel pressure regulator

well particular on electrical problem foot control is a switch of motor that deliver speed varies on how you press the foot pedal it consist of circular thick plate carbon the old model and the new one electronically control of power ic,It depend on how this pedal was contro.Anyway besure the power is off or unplug the machine; this control was been connected in series connection to the motor which you can test if your foot pedal control is defective. Disconnect the line wire holding foot pedal from the terminal inside motor assembly.If your not qualified electrician don.t do this.Connect the two terminal wire that inside the machine where the motor mounted.This connection is supplying your motor in full speed,Declucth your machine from the handwheel so that the motor run only.Plug the machine and switcn but you must jug only if the motor run in couple second of course without the foot control this was disconnected already.So your foot control is defective vice versa if motor does not run without foot control motor is busted.
how to fix if foot contol is defective, in carbon type you must replcace the circular thick carbon.On Electronic control check the IC if this open or some capacitor and resistor are open,Replaced any pars that had been short circuited.If the motor is defective replaced the carbon brush mounted at two side of motor case,There is an opening port.The carbon brush has spring holding push this carbon brush to the brush armature of rotor.