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Id say either Left bank has a tear in the head gasket on # 5 or with all of the cylinders low/lower, if its a 3.0L its likely a cracked head. They're not super expensive in the new castings with the better valve seats, and I can only guess without hands on myself but, usually that's been the case is a fine hairline crack and its caused a tear in the gasket.
Just had a similar situation with a customer/family members 3.0L, just opposite side, # 2 cylinder. I think he was at 112 with opposing 143 and 138 if i recall. Doesnt mean I am absolutely right, I could be a football field off. But it is rather ironic same symptoms, could be same problem.
Clear crack shown on #2 cylinder
And it went through the water jacket chamber.. which soaked the gasket, one day it just said "nahhh"
New heads (Pair), NO cores as they are new, with Stainless Steel valves and valve seats, assembled (Stage I setup).. https://www.12degnorth.com/product-page/heavy-duty-cylinder-heads-ford-3-0l-ohv-v6-1 if 4.0L.. https://www.12degnorth.com/product-page/heavy-duty-cylinder-heads-ford-4-0l-ohv-sohc-v6
The 3.0L heads are known to crack rather easily, especially if North of 200k miles on top of the fact the exhaust valves and valve seats themselves are complete crap.
It's a 98 B4000, so it's the 4.0, not a 3.0 and it has 112k miles on it. it's lead a hard life. I push it probably too hard. I've moved and now own a small farm, and I could really stand a full size truck... but use this like one.
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https://aroundincircles.net/
1998 Mazda B4000
Mesa, AZ