1995 Toyota Celica Stalls after warm-up

Hello and thank you for your service and attention; Allow me to introduce myself, I'm a 47yr old electrician and consider myself to be technically astute. My debit card balance is embarrassingly low at the moment but should change very soon. The problem is with a 1995 Toyota Celica, 1.8L 7A-FE engine approx 140K. Let me stress, while the engine is warming up it performs beautifully, however, once warm it wants to stall when the throttle is opened. The change is sudden and dramatic and seems to worsen as the temp rises. The "check engine" light DOES NOT come on. I cannot find a vacuum leak. I've tested the TPS, intake air temp and engine coolant temp sensors with an ohmeter and they are all within spec. Interestingly, if I impede the airflow (slightly) at the intake with one hand while operating the throttle with the other hand, it responds properly. When driven by an extremely patient driver, it is possible to feather the throttle until the RPM's come up though I did find myself sitting through a few traffic lights (much to the dismay of those behind me). If this were an older car with a carb and points, I would immediately repair the leak in the vacuum advance but this car seems to be smarter than I am. I might consider investing in a code reader but since the "check engine" light isn't coming on I'm not sure an error code is being registered. What am I missing?