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It keeps failing the emissions idle test. the garage thinks it is the computer. What do you think? I have changed the O2 sensor, catalytic converter, I have cleaned the IAC, changed the plugs, and chaned the PCV valve. It reads 0.00 CO% at 2500 RPMs, and 37 HC ppm at 2500 RPMs, at idle it reads 2.81...

mx3sohc wrote:spray some carb cleaner around the areas where there are vacuum lines, the idle will raise when you find a leak as the the fluid will burn off when it gets sucked in.

I did that still no leak. I am thinking it might be the IAC

I have the same problem, but i can not find a vacuum leak. I have replace the battery (it was bad), i have also replaced the alternator. It is a stock 1993 4 cylinder