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I suspect that the Halltech Magicbox I have installed may be causing me trouble during certain driving conditions and I'd like to remove it and try a couple of things without it to see if I am correct. However, after disconnecting it, the car runs like crap. I know I need to reset something and let the car relearn but I don't do this sort of thing oftern enough to know what to reset. Should I reset the PCM? Can someone help me with this?
Yes, give a PCM reset a shot. Just disconnect the negative end of the battery for ~15 minutes, reattach the cable and go through the idle relearn process: 15 minutes idle without A/C on and 15 with it on.