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For all the times I've read about people having this problem in the past couple of weeks, my local Nissan dealer doesn't know what's going on either.
I have a similar problem - (usually) when I'm driving semi-aggressively up a steep hill on the way to home, I lose power. The engine will idle or will run OK _if_ I can get it above 3500 rpm. If I stop the car and wait 5 minutes, idling (roughly) at teh side of the road, the problem goes away and I can drive all day. The dealer says there are no codes stored in the computer.
I've read that the EGR system kicks in between 1500 and 3500 rpm. I've also seen suggested that the O2 sensor is bad, the knock sensor is bad, the MAF is bad, the computer is bad, the injectors are bad, ...
Today (after I got the dealer to run the car up the hill to experience the failure - he ran it up and down the freeway and said there are no problems), the dealer disconnected the EGR and says that the problem seems to have gone away. I will drive it this weekend and see if it really has - if so, then I guess I need an EGR valve to fix. I sure hope so becauase MAFs are > $600.
Long story short - check your EGR.
BTW, 1991 SE, 5 speed, 230K km.
Michael
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