Honda prelude struggling?

I brought my car to the shop a while ago and when they ran the computer the mechanic said it threw the code for the IACU. It hadn't effected the car's performance so i didn't think anything of it, and didn't really worry about it, Lately she's been struggling going up hills at reasonable rpm or if i really punch the accelerator it struggles too, it feels like it's being choked. So i thought that maybe the idle air control valve was gummed up, so I pulled it off the car, cleaned it out and put it back on. It hasn't seamed to do anything, I was reading online about someone with a similar problem and one response (which is what was done to correct the problem) was to adjust the idle (my car idles a little lower than it used to as well), when I was playing around with the IACU i did notice some slack in the throttle cable. I was just wondering if that would be a good next step or if there is something I should do before I try that.

The time I brought my car to the shop when the mechanic said the IACU code was thrown I had the plugs, wires, and ignition coil replaced. My air filter is also pretty clean, I even took it for a SHORT drive with the air intake detached to see if there was an airflow problem.

Just looking for suggestions, thanks in advance.