Funny idle

[Phoenix1911]

Hey Everyone.

I picked up a used 2000 Maxima SE about a week ago, tonight on my way to the gym and back I noticed when I was revving 2000rpm+ and put it in neutral (5spd) the idle would drop past 500rpm, engine would start to get rough and the dash lights would dim just slightly for a 1/2 second, then return to normal, and 500 rpm solid. Performance never changed or anything like that and it never would actually stall. Now, I hadn't driven the car i almost 48 hours. Last time I drove it was around -10C, then all yesterday it was +4C and pissed rain, was very damp etc. and today and tonight the temp dropped to -30C (Canada sux)... Is it possible there is frozen moisture somewhere, fuel line? injectors? intake???? Any help would be appreciated!!!!!

Phoenix1911

[Phoenix1911]

Maybe I'm just paranoid because I just got the car, or is this totally normal and I just didn't notice before... It just dips down around 300 rpm, then goes back to 500... Could it be octane related??

[Rev_D21]

Idle speed might need adjustment but then again you had a load on the engine while you were idling. Mine does the same thing when I have the radio, defogger, headlights, and heater all going at the same time. I would see if it happens with all the loads off.