If I am not mistaking,you have the KE-jetronic fuel injection.There are
only a limited amount of adjustments you can perform.Check the airflow
potentiometer resistance between terminals 14 & 18 for a resistance of
3,200 and 4,800 ohms when airflow sensor is at rest.Between terminal 14
and 17 there should be 560 and 1,060 ohms.When the airflow sensor plate
is moved by hand to its greatest point there should be 3,760 to 5,640
ohms and adjust to specs.
Another thing to consider is a defective coolant temperature sensor,as
this is VERY critical to proper cold engine operation.
You described having to put your foot on accelerator pedal,did you by
chance move the throttle positioning switch?Fuel injected vehicles do
not require pumping the pedal and is also not recommended.