atmospheric pressure sensor for carb?

[lostforawhile]

hey what is the sensor that is supposed to be under the drivers side fender? according to my book it's an atmospheric pressure sensor. I have a bunch of vaccume lines that disappear into that fender on my dx. I didn't know carbed cars had one but the book says it's there. I figured it was tied into the vaccume control system somehow. I've been working on these cars for years and I still get a headache working on this carb. is this some kind of wierd regional emmision control device? the car always acts up when you get low pressure like right before it rains. the ignition is fine,the plugs are fine etc.

[A20A1]

I think it was for high altitude regions.

[lostforawhile]

wierd,this car was sold new at Naley Honda in Atlanta,def not hight altitude,it doesn't show under the hood as a high altitude model. those lines go into the drivers side fender though. have to take the fender off I guess.