Can't fix throttle and Short ram intake question.

i need to know were I can get mounting bracket and coupler for a short ram air intake for a 91 eclipse. Also when my car is in park or neutral it idles up and down, but when in drive or reverse it doesnt. Sometimes when I let off the gas and begin to slow down when coming up to a stop it will go up and down in drive. But when I tab the break it stops all of sudden. Ive cleaned several sensors and changed the fuel filter, Ive grounded the computer out and messed with the idle screw as well. I have no idea what to do. Someone told me it might be a vaccum leak or the timing. Its wierd that when I start to coast to a stop in the road that it idles up and down in drive but when I hit the breaks it stops, it doesnt do it when I am sitting still in drive either. Sometimes, but hardly ever, it won't do it in park. As for the intake I bought I need an adapter for the sensor that plugs into the stalk intake. By the way the car was doing this before I tried to put the intake on. I thought replacing it with something better might help the problem, but I don't have all the necessary equipment to get the job done. When it idles up and down its between 1000 and 1500, it goes back and forth.:shakehead At abouth the speed this smily is moving, maybe a little slower. The car is an automaic transmission 2.0 gs. Thanks for any help.

I'm not familiar with the 1st gen, but have you looked at teh MAF sensor?