Problem Solved 
I ended up taking my JD to the local dealer for service as nothing was working.
Turned out that 1 of the push rods on my 2 cylinder engine had slipped off the rocker arm. This isn't a common problem but it accounts for the lack of power. This effectively cut the power output to half of what it should be. This was why my mower was stalling.
The giveaway in diagnosing this problem is the spark plugs. Removing the spark plugs will indicate if the cylinder is firing or not. If the cylinder is firing the spark plug will be dry. The non firing cylinder shows the spark plug is "wet". It's wet because there's no combustion taking place with the push rod dislocated from the rocker arm.
Simple fix and she's running a full power again
I ended up taking my JD to the local dealer for service as nothing was working.
Turned out that 1 of the push rods on my 2 cylinder engine had slipped off the rocker arm. This isn't a common problem but it accounts for the lack of power. This effectively cut the power output to half of what it should be. This was why my mower was stalling.
The giveaway in diagnosing this problem is the spark plugs. Removing the spark plugs will indicate if the cylinder is firing or not. If the cylinder is firing the spark plug will be dry. The non firing cylinder shows the spark plug is "wet". It's wet because there's no combustion taking place with the push rod dislocated from the rocker arm.
Simple fix and she's running a full power again