2002 Chevrolet Astro Engine problems

Low coolant light on my 2002 chevy malibu has been coming on. The chevy dealer checked the low coolant light coming on, checked for low coolant. Found intake manifold gasket leaking internally. Coolant mixing with oil. *Nm

I attempted to make a left hand turn across two lanes of on coming traffic (speed limit 55 mph). I push down on the accelerator, the van moved into the on coming traffic lanes and the engine died. Cars had to quickly apply breaks to avoid hitting my van. It took about 20 seconds to get the van started and out of the intersection. The van was towed into courtesy chevrolet and the distributor cap and rotator were replace. I was told everything was corrected. This was not the case as the same problem happened...

When the vehicle was started in the morning, the brakes made a grinding noise when depressed. The vehicle was serviced by the dealership twice and they replaced the brake disc, rotors and shoes. While driving down a hill with the brake pedal depressed, the brake system overheated, and a burning odor filled the cabin of the vehicle. *Ak the brakes started to pulsate again while going down a mountain, a noise was heard coming from the driveline between shifts and was unable to be duplicated, the transmission slipped and shifted erratically, the engine would break up on a slight acceleration due to the distributor cap and the rotor being corroded. *Sc *jb

While driving a loud comes from underneth the vehicle causing a distraction. Please add any additional information. Ts