I'll search for the replacement procedure here. In case you find it please post. You had mentioned the 3 wires....is it visible when I remove the airfilter housing ??? Is it the plug with 3 wires that plugs into the POT ???

Now, on the AFM POT procedure:
I found the procedure on this forum by Steve Brotherton & sbourg. I removed the old one and was surprised to find that it had very little wear on it. Since I already bought the new one, I went ahead and put it in. I basically marked a line around the exsiting one and installed the new one within that line. I had to move a tad bit CCW to achieve .7v on pin 2 with pin3 grounded. I agree with you....it was messy unplugging the FPR with fuel leaking all around. I did unscrew the gas cap and stuck a screw driver to keep that lid open which I think helped minimise the fuel leak.

The new POT did not seem to help. The erractic idle is still there. The CEL is still ON (after reset) with code# 4. If the 3 wires you mentioned look good, then I am looking at AFM replacement most probably. Thanks for your help.

smk_texas
98 s420
93 190e