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Have you tried spraying starter fluid around the intake for any leaks? It sounds like an intake leak. At idle the intake has positive pressure and under load the intake is under vacuum. Which could explain why the Long term trim is so dramatic when driving.
Fuel injectors can fail intermittently so changing them might be a good idea. I bought GB OEM reman injectors from rockauto and they came with new seals. If you clean yours, the cost will be the same but if one or more are defective, now you need to buy new injectors. On my car, I had bent the TB metal gasket previously and created a leak. Its cheap and easy to replace the TB gasket.
Also I had spilled some coolant above the intake runners where they mate to the head. While finishing up the injector install, I saw small bubbles coming from number 3 intake runner. The right thing was to replace the gasket. What I did was clean it and pack it with black FIPG and its been sealed ever since. What I saw was bubbles at idle and then they diasappeared under accleration.
Keep looking. Its probably some cheap hose or gasket leak.
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