After much delay and after double-checking timing....I fixed the o-ring located in the joint between the MAF and the air filter housing, which had a split in it, possibly allowing the MAF to ground on the housing. The 90 still stumbled under load....
So, I went back to the circumstances around when the problem began ....the truck began stumbling/ hesitating after being driven home in a downpour and parked for a few days.
When chatting with an old Houston Land Rover Club pal, he recalled a story of another member's 90 taking on water through the wiring harness, which found its way into the ECU. I pulled my ECU and water started pouring from it as I was handling it. After I took the ECU apart, I dried the circuit board with a hair drier.
Reassembled the ECU, and the truck fired right up. Acceleration is restored, and she runs great!
Now, I need to figure out how to seal the harness and ECU.
Thank you to all of you who helped out along the way!
'94 D90 ST "AA" Yellow - Bone Stock (Just Bought)
'01 Disco II with Mods