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Hi Im David ,,how does the vehicle idle?
ok. try cleaning the mass airflow sensor, idle air control valve, egr valve and throttlebody plates.... it could be all carboned up.
hello and welcome to just answer, my name is Peter and thank you for allowing me to try and help you. So to get a better picture of what we are dealing with a couple questions please.What engine do you have in this FJ ? Have you flushed the injectors at all? Did you have it scanned for any pending or history codes? After it warms up it runs completely normal with power and no missing under load or at idle?
that's what I suspect the temp sensor, do you have a scanner that can read all perimeters? that would show exactly the temp sensor readings at each temp. it's one of the main inputs to the ECU to enrich en the fuel at certain temperatures. It also has an air temp sensor so check both easy way of checking them is start off cold and put ohm meter across terminals and rum till warm, see if the value changes if not then that's defiantly the problem.