What can cause the RPM on a car to jump while driving is a problem with the transmission. It could be a problem with the gears in the transmission itself.
Yes, the computer is programmed to only allow a certain rpm while in park.
o2 sensor
while you are in park? That should be normal. While in gear or driving, no that isn't.
Erratic RPMs while driving or in park could be due to a faulty oxygen sensor. It is also possible that poor gas is being used.
Many things can cause lag while driving at a low RPM but not at a high RPM even if it is not the vacuum hose disconnected from the EGR valve as it could be the fuel filter. It can also be the park plugs.
It is normal for the RPM to increase a little when put in park or neutral. If the RPM increases by a lot, then you need to adjust your idle speed.
Should be about 8 or 900 RPM.
The rpm's are not at a high enough rate when the car is idleing to engage the clutch plate on the compressor. To get the car to blow cold in park simply give it some gas to raise the rpm's. Belinda from Texas
No, because the tachometer actually reads the rotation of the engine, not of the wheels and therefore reads about 500 RPM while in park.
senor
If it's a stick, it sounds like the clutch or clutch componets.