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Yes it will.... I have measuring equipment in my car for tuning and it is very voltage sensitive. Before I made a grounding kit for my car, I would notice that by stepping on the brakes, it would fluctuate my AF by .5 hence 14 instead of 14.5. It would fluctuate 1 AF level if I had my lights on and stepping on the brakes hence 14-13. This is of course at idle, I believe that under driving conditions, I don't think it fluctuates very much but during idle or stop light stand still it does..
I dunno most boost controllers have a voltage checker built in, you can use that to check it. Also you can put a voltage meter on your battery and test the voltage in your battery while at idle with the headlights on and off.
Secondly, what i think helped me a lot was grounding the ignitor ground to the a good chassis ground instead of harness ground. Harness grounds are usually really crappy and I have a burnt ignitor to prove it. I don't think you need to pull stuff out yet... Do a couple of things first and then possibly make your own grounding kit which is discussed here in the forum or you can just ask me. Do you have a light weight pulley system with some audio equipment, see if turning off the audio equipment helps as well.
Fluctuating voltage sucks ass and in a 240 it always happens cause nissans just suck in that way.... but not as bad as Toyota Supras.....
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