Help My Car Broke

i also think it could be the air fuel thing but i did have a check engine ligh that came on about 6 months ago but it just went off after a couple of days...so i didnt think nothing of it and just drove, its funny that you said the tranny, my car is an automatic and i sometimes shut the car off and cant take the keys out because it dosent register that it is in part until i pump the brakes and move the shifter thing around, yah but the car will stay on as long as i hold the key in the start position but right when i let go of the key it just dies off and when i hold the key in the start position it will stay running but it will make a squelling noise and also when i put it in the acc thing nothing works but the stereo and the windows wont roll up....