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Hi,
Yes you are right about being gone from the board. Your profile has you living in Alabama by default.
I haven’t seen that in quite awhile. It is sort of a shame though as to know what type of climate the car has lived in can help obtain possible clues to the condition of the vehicle.
I’m putting together an idea like the other poster that the IAC is sticking to some extent but that’s not totally it.
You see, the IAC is spring loaded for a positive return to closed.
The ECU operates it after get a signal from the “throttle switch” saying to idle the engine or the driver is stepping on the gas.
There a transition to start an into a program to add power. So you say it’s not stumbling or hesitation involved so that can put it back on the IAC being dirty territory.
Now that I got you thinking the throttle switch think that it has a plate inside the mechanism that can get smutty. The throat of the air intake has tiny vacuum ports that control fuel rail pressure so there’s another cause for erratic idling.
And then there is the clause that extra air is sneaking into the intake manifold from a bad vacuum hose.
And then there’s another extra air issue that can come from the larger hose connecting to the throttle body.
It connects the AMM to the throttle body.
You cannot have any holes or tiny cracks in the volutes or it will affect running mixture that includes idle greatly.
So basically I’m saying you need to give the car some TLC.
There’s no one simple answer but to say it needs some attention.
Work with and think with what I’m trying to put into this and more clues will guide all of us on the board to a more definitive answer.
Ultimately your time and patience will fix this problem but you took a great step in the right direction, so, “good on ya,” as they say in New Zealand. I visited there once many years ago. 😊 more sheep than people, I was told.
By the way I’m a 240 man so its problems were inherited over to the 900.
I do not know how much difference there is but the basic principles are in that car and I have never seen under the hood of a 900, except at junkyards. 🤔
Good luck and I hope this helps clean or clears things up for you.
Phil
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