I've just had the same issue with my 744, B200F with LH2.4, the fault was with the Coolant Temperature Sensor-it's IMPERATIVE that you use the Bosch iteration of the sensor as a replacement, the cheap pattern sensors are rubbish. The ECU needs an accurate read from the sensor to govern fuelling correctly, the cheap pattern sensors don't provide what the ECU needs reliably...Bosch is the only way.
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Barges of Distinction:
'96 945 SE LPT M90
'95 945 GLE D24TIC M90
‘88 745 GL B200E M47
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