code p1174 and others please need help my inspiction sew days away

Question

Hi,please i need help .. this how start
i did have all of sudden code p1174 so i did replace the valve cover gasket and O2 sensor bank 1 &THE CRANK CASE VALVE hoping will solve it i drove the car to reset the moniter it set and after one hour the the code p1174 &maf code so i replace the maf and the spark plug the code of the maf goes away but the p1174 remain and the car ideling not right but not so bad and i notice the the transsmition light ligt up but when i restart the car doesnot and i can drive the car ..so i check the spark plug one more time and the coil and start thrown 13 code p0300and all 4 and p1509/p0120/p0201 including the p1174...
- i did spray carb for vacume leak i can not find nothing and i did change the boot to the throttle and mag and the hose no leak i can find.it just can not be all went bad somthing trigering this satiution......
please i need help thanks

Answer 1

P1174 Fuel trim adaptation (lean condition)

P1509 Idle air control valve

P0120 Throttle position sensor

P0201 Injection valve (fuel injector number 1)

Check and inspect the number 1 injector connection, if one of the fuel injector does not fire the code P1174 is the result of this condition .