2002 honda accord 4 cylinder automatic won't go into gear?

I left it in D4 last night on accident and didn't put it in park. It will turn over and turn on but won't go into gear its like its stuck in neutral.It will go into the different gears but it won't go anywhere out of my driveway. Any advice? Where to start? I put some bars stop slip in it but it didn't help.Haven't had any problems prior to this.

Transmission grind in 1-3 gear at low rpm's?

I drive a 1992 Honda Accord EX. I Hit a speed bump a little too fast and hit the ground really hard. (the car is lowered about 4- inches from stock). Now when I shift in 1st through 3rd gear there's a grinding noise coming from the left side and you can feel it too, but when I'm above 2 rpms the grinding stops. I know my car might be ****** at this point, but I want to know the exact problem so that I can possibly fix it or know if I should get rid of the car.

Transmission oil pump may be failing?

The transmission oil pump may be failing on my 99 honda accord. Or my torque converter may be going bad. I was told to let the car warm up for 5 minutes an see if it still happens and it it does do better. Before it seemed like it was coasting/didn't want to move when trying to get out of a parking spot. Warming it up does seem to help with the problem, but I'm wondering it that is a clue to narrowing down which problem it is?

Car problem, 2000 Honda Accord V6. Details below?

Having car troubles.
My car is a 2000 Honda Accord V6
Symptoms-
1) Revving while parked
2) Idling at 2k rpm when stopped at lights
3) Much louder than normal when stopped
4) Revs when down shifting to (I think) 1st gear (its automatic) when i'm going to stop
5) Hard to brake/brake sounds like its kind of grinding when I stop and when i go again
6) Temperature gauge was higher than normal
7) When i stopped the car and opened hood the engine felt very hot, and was smelling
8) Check engine light came on (It is late at night so I haven't been able to bring it in to place to get code)
9) It sounds like air flow is not quite right

What i checked-
1) Oil level/color is good
2) Coolant level is good
3) Brakes got changed not long ago
4) Oil got changed not long ago

What i've been able to narrow the problems to being down to-
1) Vacuum leak (pretty sure on this because air flow sounds screwed up when listening to it
2) IAC valve issue
3) EGR valve issue
4) (Maybe) coolant problem (although levels are good?)

I won't even pretend to be a big car person, but I have enough common sense/physics knowledge to figure out what i listed above. I plan on bringing It in to a place by me at 9am (its 2am right now) and want to have an idea of what it could be so I don't get ripped off. Any answers by then would be great.

Added (1). Another symptom i forgot about - It seems to be/feel like its accelerating on its own as i drive (no cruise control is not on durrr)