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im not a mechanic but i will try to help.

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OBD-II Diagnostic Powertrain Trouble Code For Engine

Fuel And Air Metering (Injector Circuit Malfunctions Only)

Ambient Air Temperature Sensor Circuit Low

Cold Start Injector 1 Malfunction

Exhaust Gas Recirculation Sensor B Circuit High

this is a generic code which obviously differs from car to car. it seems to boil down to an emissions issue, and since you removed your cats and altered some sensors, this may be the closest dtc the ECM can give.

you may not have a diesel engine but you do have cats, and along with the o2 sensors, they tell the ECM what the particulate count is in the exhaust and adjust voltages, etc., as needed to keep emissions at bay. since you removed/modified some of these items, the ECM is not getting the data it expects, causing this potential DTC.

some things to check:
1- plugs and coil packs
2. compression
3. wiring to and from the 02 sensors

are you driving the car a lot? getting the engine hot will burn off the contaminants so driving it on the road for half an hour or so may burn this off and improve things.

i would imagine your mpg is suffering as well yes? what about torque and overall performance, has it slacked? look up the "ecm reset" on this forum in case you dont know and reset the ecm.
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