Hi! I am no mechanic, but will try to offer a few explanations. It is very possible that your clutch has worn out. The clutch essentially consists of two plates which contact when your foot is off the clutch pedal ( or when you are not changing gear in an automatic). The stress of going uphill could be causing the two plates to slip against each other before grabbing again, causing the car to shudder as power is abrubtly applied to the wheels in a staccato way. There may be a smell of burning too. Alternatively, perhaps the engine may not be running on all cylinders, which will result in a clunky sound, or the timing may be out, which will result in what is called pinking. (see the wikipedia site). http://en.wikipedia.org/wiki/Engine_knocking
Hope this helps.
because it is going uphill and the engine has to work harder?
No the can go faster downhill or uphill
It requires extra power to go uphill, against the pull of gravity.
downshift
gravity!
noo
Gravity.
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Engine is in need of tuning.
A Ford Ranger may die going uphill due to ignition problems. There could also be a problem with the fuel injection or fuel pump.
not overdrive... it depends how fast ur going
It depends... the object could be falling, going straight, going uphill or going downhill.