RPM goes down
I have a Toyota Premio 2004 which had a run of 130,000 km. the engine have been replaced two and half years ago. now the engine is performing so bad recently. i checked for everything. Throttle body is ok, plugs and coils are ok also, valve clearence in ok, pressure of the four cylinder is ok alsso. but still the rpm of my car at drive goes down to 500-550 and vibrates a lot. i tried to increase the rpm from throttle body even to 1600 but it goes down to 500 automatically. no way to resolve the issue. the car also stops when running slow or trying to turn right or left. i cleaned th throttle body even changed, but no change. engine mounting are ok. when turn on the ac the rpm does not increase a lot in this situation. 50 increases. can you help me out, i am fed up with this car for the last four and half years, can not sell either due to some financial crisis.
