Please Help! What could it be if my car waits too long to shift gears and I am now starting to smell gas?

Please help! For a while now when I start my car, it seems like it is running really hard and loud. Also in park, it revs up to between 2 %26amp; 3 rpms. Then while driving it takes it forever to change gears. Like it waits too long and it is just reving up the whole time until it finally changes to the next gear. This morning I started to smell gas and now my engine light is on. Has this happened to anyone or would anyone have any idea as to what might be wrong and how much $ I am looking at. Thanks!Please Help! What could it be if my car waits too long to shift gears and I am now starting to smell gas?
It could be various things depending on your car. First thing that it might be is the transmission, and that could be anywhere from 850-???Please Help! What could it be if my car waits too long to shift gears and I am now starting to smell gas?
Your late shifting of gears might be that your transmission is bad, this is not uncommon for automatic transmissions. As far as the car reving high in park that may be because your throttle may be too high, maybe somebody moved it. It's really simple to fix, all you need is a wrench (sizes vary) and you can adjust that. The smell of gas can have different causes, it may just be as simple as getting a new fuel filter because yours might be clogged. About the transmission, does it hesitate when you accelerate?
could be timing

might be a sensor

does the check engine ligt come on?

if the engine check light comes on, e-mail me and ill send you and explanation on how to check that without going to a shop to have them plug in a computer