Sounds as if you've tried everything except a cylinder leak down test.
I'd try that next if it was my truck. Unfortunately, this could yield bad news so brace yourself. IF pressure loss is due to an internal leak of any kind, it won't be good news but at least you'll have a more precise answer of why it's loosing pressure and what the resolution should be.
If you're thinking of rebuilding it anyway, you may not want to risk further damage (in my opinion) and rebuild properly when you can afford it.
|