I have a chrysler concorde 2000 it starts but when I put it in drive or reverse and step on the gas it will not move plus I think something broke under the engine whats the problem?

SOURCE: I have a 2000 Chrysler sebring that wont idle.

check to make sure all vacuum lines are on especially the one behind the throttle body also get a digital volt meter and check out your throttle body position sensor and also ask yourself when was the last time the fuel filter was changed

SOURCE: car stalls when i put it in drive or reverse,

Sounds like your vacuum assist brakes diaghram has sprung a leak. Pull the hose to the assist and plug it with a bolt or something. Then try it.

SOURCE: I have a 2000 chrysler concorde that the engine light just popped on - the error codes are po302, po420, po340

P0302-cylinder #2 misfire detected
P0420- catalyst efficiency below threshold bank 1
P0340-No cam signal at PCM.
The Cam sensor most likely needs to be replaced first. Clear the codes after that and drive and see what comes back on.

SOURCE: car is blowing white smoke from exhaust when i step on gas

The most likely cause is a blown head gasket,but it could also be a warped head,was the motor overheated prior to the problem starting? The white smoke is steam,check the underside of the oil fill cap and dipstick for a grayish brown residue,check the coolant for a low level and oil conatamination,either of these conditions verify that a head isn't fully sealed.Unless your moderately skilled mechanically this a job to be done by a shop.A good shop will perform a leakdown test to verify this.

SOURCE: Shift problems in 95 chrysler concorde transmission

Sorry but if your reverse is having trouble you will probably have to replace or rebuild tranny like me. Otherwise try new filter and fluid first.