Engine light on, car halts when turns sharp, vibrates and rpm lows when ac on. on 2001 Honda CR-V

1. The engine light is always on.
2. The car halts when taking reverse or sharp turns or u turns.
3.The car vibrates jerks violently when ht ea.c is on and the idling RPM drops down to 200 as if the car is about ot die.
This is after i had replaced the solenoid switch and the D gear was continuously flashing.

Asked by for the 2001 Honda CR-V