Mr. Psr7, try with the Potentiometer. Use the Multivoltmeter and contact the Positive led -Red- with the Pin 2 and black lead with the ground. Star the engine at idle in park.
You have to read 800 Milivots +/- 250 MV. If not, try to rotate the Pot litlle bit until you get close to 800 MV.
The new Pot is $71.00
Many threadid about it.