Fluctuating temperature is almost ALWAYS caused by a faulty thermostat. Replace it as soon as possible to avoid engine damage.
Variations in idle speed can often be caused by a faulty EGR assembly. Have it checked.
Needs new speed sensor or if it has a cable to the speedometer it needs to be replaced along with the housing.
it shakes rapidly and jumps around crazy.
have the tps sensor changed
Time for a serious tune up.
Have the Transmission serviced (Filter and Fluid Change) - Should take care of it.
A cars tach jumps and runs with engine rpm.Sometimes if it jumps and changes engine sound,the throttle position sensor needs changing.If it jumps with no engine speed or sound change it means your alternator is going bad.
This issue could be caused by a faulty speed sensor, loose wiring, or a malfunctioning gauge cluster. It is recommended to have a mechanic inspect the speed sensor and wiring for any issues and replace or repair as needed. If the problem persists, the gauge cluster may need to be replaced.
Your clutch needs adjusted or replaced.
if it drives normal except when you let off the gas the rpm jumps then it is a map sensor
Check the solenoid. This happened to us and we had to have the solenoid replaced. Part cost about AUD$240 but labour was $800!
Bad fuel sensor or float in the gas tank. Careful you don't run out of gas ,it may read incorrectly.
*Why are jumps called jumps?In order to clear an "obstacle" of any sort, a horse must jump over it. Therefore these "obstacles" became known as jumps.