I have a 25 year old aead 200Le gas miller welder with onan engine. Well maintained not heavily used. my problem is when the switch is on weld it goes to high idel but does not weld. The only way I can drop to low idel is when I switch to power. Note the auto idel switch is on but even if i switch auto idel off still high idel. I was useing the day before and was welding fine. I have the owner 's manuel with schematic diagram. Please help. This is my first forum I have ever been on so don't know proper protocol.