Amar, check under the hood and see if the sudden change in fuel concentration caused the rubber boot between the throttle body and the air flow sensor popped off. Causes a huge vacuum leak which can sort of reseal out of suction letting the car "run" till under load. All it needs is the band clamp refitted and tightened down. A freebee, if that's the problem m8. Sounds like a backfire when it goes.
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