Man, not a lot to go on here. Possibly a skewed MAF sensor at cold temp? Could be trimming the fuel, bumping the idle may be giving it enough fuel to pull out of it? You can get a new MAF sensor on eBay or Amazon for under $30. Just google the part # on the MAF and it crosses to a 2007-2009 Toyota Tacoma I believe. OEM Hino MAF’s are like $220 I believe . I would suggest if possible to spend a little time in the morning monitoring the temps, injector balance rates, injection quantity, intake air temp etc. You may notice something not remotely possible like -40 degree ambient air temp. If you pm me your email I can send you a “expected value” chart for what is nominal at idle? If it is not setting any codes now I suspect it will shortly. I’m assuming the oil condition, level and air filter are known good as well. Possible egr valve issue flowing when it should not. The egr valve will not receive a command to open until 104 degrees. Can it get that hot in 1 min where you are?