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I would suspect that it might be a chemical in the carpet or drapes or upholstery. I don't think an LP leak would do that and you have that detector as well. You might have someone wand it for chemicals with an electronic detector and see if something shows up. OR perhaps the carbon monoxide detector isn't working. The fact that you mentioned it being worse with the engine running makes that suspect. Hope that proves helpul here. Please get back to me if you need more as all follow ups are included in our fee. R.J.
You would smell the LP leak............and you have that detector as well. I don't think they can put formaldehyde in these any longer. If it gets worse when it is driven, that sounds like this. What about a smell out of the waste tanks? What kind of chemical are you using in the tanks?