The Gen I Montero MAF Sensor has some cardboard stuff in it. That may be why you can't use cleaners. I have never looked at the Gen II MAF in my 95. Your idle mis issues Especially when cold are probably linked to the extremely complicated almost impossible to seal or keep sealed intake on these Butterfly DOHC engines. Also the idle control motor goes bad on the throttle body and idle won't kick up right when cold starting.

1990 Black Monty LS Over 300K' 1993 Isuzu Rodeo LS 4x4 46k (yes only 46K!)1989 Honda Transalp 600 Africa twin,