Car keeps shaking

SOURCE: My 99 Jeep cherokee laredo keeps overheating

the reason it getting hot when stopped is the fan relay is out thus not turning the cooling fan on,this is a time consuming job,the relay is located on the passenger side tip of the frame behind the headlight,the grill,headlights,bumper,and tip of the front fender has to be loosened up to get to it.
The relay is about 70.00 or so,the engine cools down when you drive as you are forcing air through the radiator to cool it down,as for the heater issue probably caused by boiling the anti freeze out ,
To make sure the engine is ok do a compression check to verify the headgasket and heads are ok,as for smelling the sweet smell which is antifreeze probably due to overheating and pushing the fluid out of the cap or tank.

SOURCE: 2006 BMW 523i shaking in the mornings

Strange, it sounds like you've got a dead spark plug, but that would be continuous, not only in the morning, the other explanation could be that the engine management is injecting too much fuel, flooding the cylinder, and wetting the spark plug, which would explain why you need to wait 5 mins for the fuel to evaporate. Try disconnecting the battery for 30 minutes to reset the EMS, if that doesn't help, get to a workshop and let them check the EMS with a computer, the electric choke may be sending the wrong signals to the EMS. Hope this helps!

SOURCE: car wont start...sometimes

Sounds like a bad starter solenoid, usually cheapest and easiest to replace the starter and solenoid as a unit. It is always best to check for power between the solenoid and the starter with a test light, if the solenoid clicks but the test light doesn't light up you have found the problem in the solenoid.

SOURCE: Car dies while driving, now it won't start sometimes

Could be a fuel pump that is going bad. Some times when fuel pumps go bad they cavitate and pump not just gas but also air. If you get too much air in the line and not enough gas the car won't start. Have a mechanic check your fuel line pressure.

SOURCE: 1997 LeSabre- Security light in dash is constantly

ok the security light is on because it isn't reading the chip pellet in the key. The problem with the is usually either bad key, bad pickup in the cylinder, or bad paskey unit. if it is the key or the cylinder then you can bypass the unit by adding a resistor to match the key resistance and attach it to the violet and white wires at the bottom of the column. I do alot of bypasses on these passkey units, it works wonderful.

Your stalling however sounds like a different problem.. since the security system only disables the starting feature and not the running of the vehicle. But with the 3800 engine the cranshaft sensor or sensor wiring, as the engine gets hot causes shorting to the computer and shuts engine down. I would look into that to solve your problems.

Testimonial: "Thanks! I have had the crank sensor replaced twice in the past 2 months, the new one just last wk.Also cam sensor, coils, wires and plugs. AArrg!"