Trying to figure out what is wrong with ssv wether its solenoid or impact switch.

Got the code and went to local shop had the ssv out and cleaned. When put back in its move just fine and with snap on obd tool the valve opens and closes when not under any load. But once under certain amount of load it no longer it just gets stuck open.

Any suggestions on what to test or how much it is for a solenoid replacement.