Possibly a loose fan belt, or dirty cable ends on your battery cables.
Battery fails to charge, alt light comes on, sometimes only at low revs. Check with meter shows low or no charging voltage (close to or less than battery voltage) voltage does not increase to charging volts with engine revs increase
Check coolant level
If it has no display for gears, and you don't count them in your head, you can only tell it by the speed you are going and the amount of revs, but only if you are quite experienced. Which gear you are in is quite irrelevant however. What matters is that your revs aren't to high or to low for the speed that you are traveling or for the power that you require.
Pro: you are able to change gear when your engine revs are different from your transmission revs. Con: when torque is high or the difference in revs (see above) is too big, it will slip.
Pro: you are able to change gear when your engine revs are different from your transmission revs. Con: when torque is high or the difference in revs (see above) is too big, it will slip.
Because that's how an engine runs. it can only ever rev up if you give it gas. no gas, no revs. more gas, more revs
Vacuum leak?
Perhaps throttle plate in throttle body is stuck - try to free with a screwdriver
you are stepping on the gas peddle too hard
it depends on the engine. generally it boosts the performance at high revs
try this Could be your battery is losing power when turned off and is charging. This would only be a few hundred revs. Do you have anything extra left turned on when car is not running like stereo, amp, etc.
Year? Replace ECTS and clean the throttle body