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Message: <blockquote data-quote="jarance" data-source="post: 427079" data-attributes="member: 21">The car is firing with the first crank. Problem is during the first 1 minute, the engine die off like no petrol is coming. After rev a few time and can feel the engine response with the fuel pedal, then it is OK. Idling speed is also not constant but not eractic. Sometime hovering around 1100 rpm, sometime 1000 rpm sometime 900 rpm whether hot or cold. (Goes up when aircon is OFF and goes down when aircon is ON)The funny thing is that the power is not coming but car is OK at speed greater than 80km/hr. When off the engine after driving, the engine become unstable again even though it is warm up. Need to rev a few time before can drive the car.Note.. I am using non original fuel pump (took from proton). Maybe it could be the problem but did not have this problem when I was using M40 engine.Did not have time to check with the diagnostic GT yet. Will do so when have the time. Still trying to sort out the actual root cause..</blockquote>