You still don't know what mixture faults you have yet... so continuing to throw parts at it in hopes of finding the right part is kinda a waste. If it is rich mixture under load it could be the MAF sensor, lean mixture at idle could be a vacuum leak from anywhere including the crankcase vent valve/oil separator.

Point is you don't yet have the details on the problem needed to even guess right, and don't have the proper tools to diagnose further like reading adaptive and multiplicative values, read the MAF values at idle, watch the o2 sensor readings, smoke test the intake system etc. That is why it is sometimes cheaper to just pay for the proper diagnosis vs pay twice as much in unneeded parts before finding the rear problem.

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