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2000 LX470 Missing Under Load on Cold Start Only


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I have recently become the owner of a 2000 LX470. It’s the Gold edition, (Air-ride, sunroof, leather, AWD, V8, etc) This girl has had several timing belt replacements, and has been kept up very well. It has had several because the previous owner had it replaced once, and then the tensioner broke after replacement. He then had it changed out again. Any how, I’ve began to notice a lack of power and a straight up misfire on cold start only. This only happens when it is below Normal operating temp, and it is enough of a misfire that I can feel it stuttering, and it has a very strong hesitation to accelerate. It has new plugs, new fuel filter, And new air filter. It also has no stored trouble codes, and does not trigger a check engine light, as well as any other in dash monitors, and has not since this began around 3-4 months ago. Please give me a word of advice!! 
 

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