1992 Hardbody lossing power

1992 nissan hardbody lossing power.
When I go to start the p/u it will idle rough, to prevent it from dieing I have to throttle it up to get past it bogging once it clears the bogging I can let off the throttle and it will idle fine for a period of a few minutes and will bog again. Then when I go to drive down the street it will bog a lil bit if im easy with it and then when I floor it it acts like its flooding(bogg really bad). Ive been reading up on it and I found that if when I goto start it if I un plug my mass air flow sensor it will start clean but idle a lil high will have very lil power if I attempt to drive on it then when I plug it back in it will runn great till I let it idle for to long or if I shut down and restart the p/u. What would cause this is it my mass airflow failing ir is it some thing more or can I clean it?