So my 88 A9L MAF conversion GT vert that I gave to my son started running bad at idle and lower rpm but ran good WOT. Since I wired up a CEL in the conversion, we ground the correct test pin and the light flashed Code 66, bad MAF signal. No problem, we put a new sensor in it less than a year ago so we swapped for a replacement. Same thing. I knew the wiring was good because it ran fine for a couple of years after the swap. So, we pull EEC and disassemble for a look. At first glance, didn't see an issue, so I get out the magnifying glasses and I notice discoloration under an electrolytic capacitor. When I give the can a little push, I can see one lead has corroded away. Since these computers now go for $150-$250, I decide to get capacitors. Solder them in and now things are back to normal. Below is a pic of the board showing where the 3 electrolytics are located and their ratings. I had to buy 10 sets of repair capacitors as that is the smallest amount I could find online. Since only the one was failed, that one is associated with the MAF processing circuit. Thought you guys might like to see this info. If anybody wants one of the 9 repair sets (3 capacitors) I have left, $5 shipped to your mailbox. PM me for my address.