have got a problem my tuner is working on my car and can get the car to idle right after start up fine for about 5 to 10 seconds then it starts hunting going down to 400rpms to about 1000rpms and if you dont give it gas it wont stay started sometimes. Well I think we are down to either the map sensor or a vaccum leak but I was wondering if anyone else has had the problem if anyone has ideas would much appreicate it. Oh and just FYI the car did idle good when we put the engine in when we initally started it and did idle good for a while so this is a new problem