So my 92 ls400 (124XXX miles) recently arose these issues after i pulled the AFM out to take the intake apart and replace the part closest to the manifold, i put it all back together and now the cars running rich, bucking when under 20mph, and idles really rough at a stop and acts like it wants to stall out. Ive replaced the cracked connector on the afm, ive bought two new sensors, both did nothing they only made it run worse, ive replaced the o2 sensors, and tried swapping ecu’s the ecu i had (from a 91) makes it run a little worse. I seriously dont know what it could be, if anyones got a tip please help i dont need to throw my next paycheck at lexus.