Yeah, I have no idea what one feels like when it goes in to lean burn. I'd assume it's something that kicks in when you're cruising steady at low power levels, and that it would automatically stop lean burn if you had to accelerate or climb a hill. But, you know assumptions...
There are other HX owners on the site, hopefully they will chime in. Me, I'd stomp on the gas if it was being gutless and see what difference it made.
They do use a TPS, so it should know what you're trying to do if you do. I'd say throw a new o2 sensor in there, but at 300 bucks...I'd test everything first. Unless you know a friend with one you could try swapping it with?
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