Ford taurus 2003 jumps while waiting at a red light and jumps when going uphill

SOURCE: check engine light came on and car is jerking and acts funny in low gears

could be the iac valve, idle air control valve.
at the beginning check for air leaks, a scanner will be enough for to know the reason,

SOURCE: I have a 2001 ford expedition it jerks while i'm

Had same problem with a f-150.
wal-mart had a deal on a gunk fuel injection cleaning process. Felt the difference as soon as I left garage.

SOURCE: 03 ford focus jerking tranny

Possibl eclogged cat converter,will cause miss and sluggish trans responce.

SOURCE: jerking into 2nd gear Ford Taurus

Take the car to a tranny shop,sounds like a torque converter problem. It'll get worse.

SOURCE: 2003 Ford Taurus, 90K, used car, engines shakes, ABS goes on

Are you getting any codes from the Check Engine Light? This sounds like it could have something to do with a sensor. Check your air filter and make sure it's clean. The tach on my 1999 doesn't really work, but it hasn't coincided with other driveability problems. The engine doesn't change in it's RPM's, the tachometer just stops working. Have your charging system checked. The shaking might be coming from bad fuel pump operation, clogged fuel filter, or dirty fuel injectors. Try putting an additive into your gastank to clean the injectors (a bottle of Seafoam is great for this). Try calling your local Autozone and see if they do free trouble code scanning. This might help lead you in a better direction.