Years ago I had a similar problem with a 1985 goldwing aspencade efi. I used a variable resistor in series with the air temp sensor. I needed more resistance. The mule is the opposite, I needed to have less resistance. So tricking computers isn't something I haven't done before.
I still think I'm still running a little rich. If I have too, I will put the air temp sensor in freezer and measure it's resistance. Then subject it to about 110 degrees then measure the resistance again. 110 degrees is about the max temp in pole barn in the summer. Lets say 110 degrees is 300 ohms and subzero is 3k. I put a 300 ohm fixed resistor and put it in series with a 3k variable. I'll locate the variable on dash and dial in the resistance I need to make it idle right depending on temp.
Keep in mind both temp sensors check out good according to the service manual, but for some reason it's running rich at an idle and there are no computer codes saying there is a problem. So computer thinks all is well when it's not.
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