97 metro hold brake and car still picks up idle

I have a 1997 metro that when I put it in drive and go it will run ok ultill I stop then it still idles high and wont idle down ,if I put it in neutral it will idle hi then slowly idle down help

It sounds like your transmission is slipping. Does it start to roll when you take your foot off the break, with the selector in drive, or do you have to goose it a bit? My automatic lugs down somewhat when ideling in drive and creeps forward if I ease up on the break pedal. As far as I know it's working like it should.

I think it is the throttle position motor but I dont know why it stays in the out position then takes long to retract to idle down

I think it is in the throttle position motor behind the tbi but why it takes so long to go in to idle down I dont know why

Your brake booster may be leaking atmostpheric air into the intake when the brakes are applied, causing a vacuum leak. Disconnect the brake booster hose and plug it. Resample problematic scenario and record results.

-mechanicmatt