Hi there, Please be informed that sometimes RPM is unstable. Sometimes it's almost 1000 sometimes about 800 or less (in the same conditions: without A/C, lights,...) It is slowly fluctuating and sometimes when rpm drops below 700 unpleasant vibrations appears as well as my car (Toyota AE100) die ( stop). I am eagerly waiting for your assistance. Please help me. Best Regards Ameen

There are basically two types of whistle noises.

* Whistle when you get more gas (increase RPM, put gas pedal, sometimes just idling but louder when you put more gas)
This usually intake-side leak.
Intake manifold itself, intake manifold gasket (most likely), even airfilter housing, Airflow meter housing (connector), anything where air goes to engine.
usually engine get rough or unstable idle when intake leak occur.
Engine knocking or pinging may feel.

* Whistle when you decrease RPM (engine brake, reduce speed, sometimes just idling but louder when it dropping RPM)
This usually Vacuum-side leak.
There are many vacuum hoses in engine room. even inside of cabin (heater control, etc)
Try to spot where it coming from.
Vacuum also connected to Brake servo, heater control and spark timing.

Put metal or plastic pipe (small PVC pipe will work fine) to one of your ear then isolate source of noise and find where it come from.

could be a TPS or even a dirty throttle body that needs cleaning. even a small vacuum leak can cause this depending were the leak is.

Afraid not. Although the light goes out it still may not be charging very little charge will put the light out. the other reason I feel it's the alternator is instead of rpm increasing it should decrease as a properly charging alternator should pull the engine which should decrease the rpm

check rpm whithout the ac if its the wright rpm.
ac uses also rpm .so when its whithout allreddy stalling ,it will for sure ,when you turn on ac.

almost sounds like the cruise control is engaging

hi you have a trigga senser on your botom pulley replace it

Yes the SMOKE is THE Indicater of Turbo Failure. Sorry to be the Bearer of BAD NEWS.

you probably need to check the butterfly. its the compinent that controls how much air goes into the engine if it is weared than in idle state air leaks into the engine sometime more sometimes less and cause fluctuations in rpm

secondly there is a rpm switch which controls the rpm you can replace that switch and check

You will need to check the Mass airflow sensor and the Idle position sensor.

sounds like the cabbruter is losing pressure cheak tubes may be lose or damaged