Well,
In regards, to motormounts, they were checked and seem to be good. Tell me if I'm wrong, but here's the way to check them... Put car in park, apply hand brake, as well as regular foot brake, and then gently accelerate to maybe 2k rpm in order to notice if there is engine flex or movement. Well, there is none with mine. I think if it was an engine mount issue, it would always vibrate at that RPM, and the truth is that it only does it when the engine is cold... There is something wrong, like maybe an injector, or a sensor somewhere that is making it not idle or run right. As I mentioned before, the car is not eating up any oil, it's not smoking at all, I'm puzzled... I'm thinking of taking it to a lexus only mechanic that was recommended to me.
One question, will the computer tell me if there is an issue with the sparkplug wires, or cap and rotors? After hooking it up and getting the 41 error code (TPS) and changing the TPS, it now reads clear. But I'm wondering if there might be issues with the wires... Certainly hope it's not an engine issue... I couldn't imagine it, since it's always had meticulous maintenance record.