EXCESS GAS IS BUILDING UP IN THE EXHUAST SYSTEM. ARE YOU USEING LOW GEAR WHEN THIS HAPPENS??? BECAUSE IF YOU ARE THATS WHY.
You may be pressing the gas pedal too hard
throttle plate stuck? I'm not sure. When I'm driving, I take my foot off the gas and the car jerks and when I have to stop and I push on the brakes the car revs and jerks forward and occasionally stalls
A car can backfire and die if the spark plugs are bad. The car could also have a problem with the timing or the catalytic converter .
The engine revs and car doesn't move.
There are several reasons why your car may be overheating. Check the thermostat to be sure it isn't stuck. If the car revs up and down, the timing may need to be adjusted.
it doesn't or it shouldent'
Slowing down
It's probably the clutch.
The reverse is "shot" on your transmission. You'll need to either rebuild/replace the transmission or get another vehicle.
That sounds like a slipping clutch or auto transmission. In either case you need some work.
catalytic converter?
No the can go faster downhill or uphill