Engines are held into the vehicle with "motor mounts"... although they should probably be called "engine mounts". Motor mounts can go bad and the engine can move excessively. If a motor mount has failed, take it to just about any reputable mechanic and it can be replaced.
Faulty gas cap or vent valve, causing a vacuum to form which is not letting the fuel to flow properly starving the engine.
Viper Car Alarms will also shut the engine down.
It's not necessary to run the engine. With #1 at TDC, you can set 1, 2, 5, and 7 intakes, and 1, 3, 4, and 8 exhausts. Rotate engine one revolution (#6 TDC) and set the rest. If it's a hydraulic cam, tighten the rocker nut until there is 0 up and down movement in the pushrod, then tighten an additional 1/2 turn. For solid cams, tighten rocker nut until specified backlash is achieved.
Down on what? Engine oil, check the dipstick. Coolant, check the reservoir.
The engine supplies the rotational force that ultimately makes the car go down the road.
it run down
Go under the engine and follow the belt down to the under side of the engine. You will see a metric size 14 bolt just to the left that runs up to the tensioner. Turn clockwise to tighten but don't over tighten.
on a 350 engine to adjust valves tighten them down with engine running then back them off until it smooths out probably about a quarter of a turn
Depending on the vehicle, you would use a wrench SAE or Metric, to turn the nut down with to tighten. You may want to go to a car parts store, and get a repair manual for your car. They cost about $16.00 Or, go to a Public Library.
when kick down the gas pedal to accelerate, the car downshift but then stalls and then engine stays rough until i turn off the engine and restart it then the engine runs normal again till the next kick down.
Be sure to check your gas cap !! The only time my Vibe has ever had the check engine light come on, is when we didnt tighten the gas cap after filling up! The car had 300 miles on it the first time!! Ug! Tighten it, and drive about 20 miles, it may reset it self if not, then when the car is turned off and then back on it should.
How- cooling oil why- overheating is bad for the engine parts