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if not air, fuel?
The idle increase at temp is odd indeed.
When you did the head gasket did you have coolant in the combustion chamber? There is a posibility that burnt coolant has coated your primary O2 sensor, and it may be reading lean and thus over fueling. If this was the case, You might notice some oscillating in idle once at temp.
Still, leaning towards a vac leak, possibly the icv is plumbed backwards??
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Stable Mates:
1987 300TD 310K mi (Hans)
2008 Jeep Grand Cherokee OM642 165k mi (Benzrokee)
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