mazda disciple

Recently I decided to replace some of the vacuum lines do to the fact my idle was wondering around a bit. So I only replaced 5 which was pretty easy and envovled no real thought. But when I start the car and drive it for a bit the idle hangs up a little its the damndest thing ? So thinking it was a faulty hose or something I put the old ones back on and well its still does it. To describe the idle hang a little better its like normal idle is at 700 ish and when I engage the clutch the idle will hang up at like 1200 for 5-20 seconds then idle normal again ? Its really odd I was just wondering if somone could give me some incite on my dilema


thanx in advance, my car is a 90 lx pro