Gas furnace control board issues: main burners never start; sparks never stop w/o flame sensor
If the flame sensor is disconnected it will keep sparking thinking there is no flame. I am not sure if that unit has a proving time limit or not. Many of the Honeywell models lock out after either 15 or 90 seconds and stay locked out until power or thermostat is interrupted or 5 minutes. 
As fo the main gas valve it may be a few things. Check the grounding. Check for continuity throughout the entire grounding path. Check for 24 volts between MV/PV and PV. I would expect voltage there since you have a pilot light. Check between MV/PV and MV. If there is power there but the gas valve does not open check the same terminals at the gas valve. Still power then bad gas valve. No power there and good ground then most likely a bad ignition module.