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Hi, thanks fr posting
The problem could be the a/c magnetic clutch relay located in the fuse box under the hood, it's designated 'MG/CL" in the diagram, the 42psi at the low port is normal with the compressor running so it doesn't sound like it's overcharged.
See if there is another relay in the fuse box that you can swap with the a/c clutch relay and it may solve this but I have to caution you that this may also be due to a compressor or clutch that is starting to go out, the engine dying at idle could be an indication of this due to the extra load on the engine, try the relay first and reply back here to me andwe'll take it from there.
Ok, you mentioned that the pressure on the low side was 42 PSI with the compressor running but we don't know what the high pressure side is doing, there could be a restriction in the system or possibly the compressor starting to go out, is there anyway you can get both high and low side pressures while the compressor is engaged?