Yes i bought my 1988 Gxl acouple of months ago and it already had a intake installed on the car. There is a vaccum tube that runs from the driver side to the passanger and then ends probably where the airbox used to be. Does anyone know what that is for and what i should do with it? I noticed when i stick my finger in it the rpms drop some. Thank for all your help in advance.

 

got a pic of the problem line and area?

 

sounds like the line for the purge valve or crankcase vent maybe, pics would help. Do you have the stock TID?

 

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Air line from the intake duct to the BAC valve. You can tell that by looking at it...

 

should i plug it up

 

If you want your BAC to work, then yes, plug it into a metered air source (originally on the plastic air duct).

 

yup, plugs into main intake tube that goes from the MAF to the throttle body. The line/plug that it goes in is under the tube not far from the top.
Wait, thats not the stock intake tube? Ok now you have two choises if there is no plug under the tube... Plug/cap the line to the BAC (your BAC won't work now) well technically it hasn't worked at all since it hasn't been pluged in. OR you'll have to make a plug for that to go into. There's a couple ways to do this. 1. Drill a hole and put a hose fitting in it for the hose to plug into, Or better yet, 2. get the stock intake tube. Those aftermarket intake tube don't help your engine at all anyway. The stock tube is straight enough and can't be improved upon, unless you supply it with around turbo to plug into and run about 7 psi on a NA engine and...........

 

It also supplys metered air to the Air Bypass Solenoid. Just adding a little bit more to what has already been said.

 

sigh - a picture certainly is worth a thousand words and lots of correct answers