Here goes. I have a 1988 GT Vert with a 331 and a TKO 600. It has Trick Flow Track Heat heads, MSD 6AL, BBK SSI upper and lower intake, X303, 30# injectors, Long tubes, MAF conversion, roller rockers, electric fan, 6AL, 75mm throttle body, BBK CAI and probably a few more things. On the KOEO test I pulled a 95 and I wanna say an 85. The 95 is because when the MAF conversion was done we didn't wire in the secondary fuel pump circuit and the 85 is because I can't find where the dang canister purge solenoid is. I've looked everywhere for it. Moving on, with the KOER test I got a 18R, 33, 41, 91. The o2 codes I'm assuming is because of the larger injectors without a tune or they are bad, the 33 is because the EGR crap, I have no smog components on this car but I'd like it if it didn't throw the code. Not priority right now though. My big concern is the 18. If I remove the spout there is no difference in idle RPM, however I'm getting 22.2 kohms at pin 4 on the harness to the computer (I don't have the diagram in from of me so bear with me if I get the pins wrong) I checked for resistance at pin 36 with the spout plugged in I get .4 ohms and if I unplug the spout I get no resistance, so that tells me it has a complete circuit. I forgot I to say I was testing from the ignition module plug on the dizzy and the computer harness. I've replaced the ignition module and the coil. Still no advance and still a code 18. I've disconnected the MSD and went back to stock. Same problem. I've googled, searched forums, I'm lost and need some help with this. I have given you as much info as I have.