Thanks for all of the replies. I should mention the idling isn't too bad. it's the stalling that is.

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I have a big list of codes, most of which are related to the swap , i.e. fuel temp , fan blower etc.

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But these pop up too:

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P1516 IMRC input error (Bank 1) Idle Air Control Solenoid Signal 4 circuit Low input

P1514 High Load Neutral / Drive Fault. ?Idle Air Control Solenoid Signal 3 circuit Low input

P1512 Intake manifold runner control (Bank 1) Stuck Closed Idle Air Control Solenoid signal 2 circuit low Input

1510 Idle Air Control Solenoid Signal 1 circuit Low input.

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P0420 Catalytic converter system bank 1 efficiency below threshold

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P0447 EVAP system vent control - open circuit

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I'd like to test the VSS too but I'm not sure how.

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Thanks again

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