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Sourced a spring and it works like a charm. Throttle returns as it should. Thanks for walking me through this!

Also, thank you for the advice on the temp gage. The throttle was #1 and then the cooling system. Going to pull the radiator and have it cleaned as the fins are pretty clogged up and i suspect the core is dirty also.
When I picked up this coach the only temp gage working was the oil temp. It created a lot of anxiety with only the oil temp gage working on the drive home.