My Mercury Mariner was driving fine until I accelerated and came to a quick stop then going down an incline it started shaking and or vibrating then after stopping slowly driving then it began to drive ok but not perfect. What could it be?

SOURCE: Stalls out when braking quickly, worse with going down hill

Assuming that the vehicle is equipped with an automatic transmission, it looks like the torque converter lock-up system doesn't release as fast as it should, so if you brake hard, the converter is still locked up and your wheel brakes stall your engine (just like pressing ******* the brakes with the clutch pedal released on a manual transmission vehicle). Normally, when you brake hard, the lock-up should release and prevent the stall from happening. Might be a bad torque converter, or a bad lock up solenoid in the transmission... Before jumping to anything else, i'd try checking the fluid level in the transmission and an oil/filter change in the transmission. Lots of times one or the other can cure the problem.

SOURCE: 2004 Nissan Quest began shaking while driving then

SOUND LIKE FUEL PUMP.SCAN IT TO MAKE SURE.IT ALSO COULD BE FUEL PUMP RELAY OR FUSE.

SOURCE: 2003 PSD 6.0L ran fine until I started off the

fuel pump when you started up the incline the tank was not full the gas went to the back of the tank made the fuel pump run dry now it no longer has the right pressure to support the engine or the filter cloged in the tank

Testimonial: "THANK YOU, WE'LL GIVE IT A TRY!"

SOURCE: sometimes when first starting the

Oil Pump inside of torque converter is on its way out.

SOURCE: 98 grand am bogs down and shakes when accelerating

May need a tune up have a fuel delivery issue. Many problems. Needs to be checked by a Mechanic.