92 honda accord

erratic idle from 700 to 2000 rpm after it kick off of fast idle already replaced the aic unit

My Haynes manuel says the following:

1 Vacuum leakage
2 Leaking EGR valve
3 Air filter clogged
4 Fuel pump not delivering suffcient fuel to fuel injection system
5 Leaking head gasket
6 Timing belt and/or pulleys worn
7 Camshaft lobes worn

Take your pick of the above. Hope this helps!

Might do what my son did and change your engine over to an JDM H22 with the JDM LS 5speed transmission. Solved all his problems! LOL