emissions cheats?

[yellow95stang]

any body have any tips for passing a 95 gt, I just bought it and am new to efi cars. I took the test about a month ago and was a little high. (had already changed gave a tune up) I took it back 2 days ago after puting fuel injector cleaner in the tank and ran it two half a tank of gas. I took it through and failed miserably. ( a lot higher than the 1st time). Next, i changed th 02 snesors and ran a can of carb cleaner throught the tb. I took it through to day and it still failed (a litter lower though). Could the injector cleaner in the tank affected the reading?
Any one have any tips for passing. I read that lowering the timing to 10 and running it hot might help. (unplug the fans?) also if i just unplugh the timing plug will this make it 10 degrees. (Timing this car looks like a pain.) I also read about putting alchol and a lower rating gas, like 87 octane. Any help is much appriciated.

ps i have stock exhaust except flowmasters and all smog equip.

thanks - Rob