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Hi A vacuum leak could cause it because when the engine gets hot, the manifold expands and closes the leak. Leaks in the manifold need to be checked for w/cold engine and smoke-machine. Or apply some water or propane around the manifold gasket area and listen for sucking noise w/water or watch fuel trims w/propane,or listen for engine revs change around the manifold gasket area w/engine running. Frankiedon
If you could have a look at the fuel trims it may give you some direction.A number of different things can cause this problem. In the meantime do a visual inspection and look for broken intake-air hoses,loose wires, bad connectors at any of the sensors. Intermittent problems are usually caused by heat and vibration. I hope I am not too late with my answer. Frank
When the LTFT and STFT oppose each other like that it happens after a fix has occurred and returns to normal after driving for some miles, but if that is not your case, I don’t know what the answers is. Just wanted to say that info. Thank you Frank
