our heater plugs do not come on when warm
when hot and about to start i do the same as you with the throttle
we are in the process of having a diagnostic check on the vehicle i do know that the pumps are in excess of £1000 gutted
turn key. wait for heatcoil light to go out then try to start.after second attempt she fires.when hot she wont start so av to keep turning her over till she fires.wonderd why the last owner got a new battrey