my Car Mini pajero 1100cc is missing on less petrol. when i accelerate the rpm comes down. I recently changed my engine to stock 1100cc the same problem persisted on the engine which i had before and now even on this one. please note that i didnt change my engine becuz of this problem. i just swapped it cuz it came to its life. i Want some experts to comment on this. the mechanic who swapped my engine saw checked the fuel pump but came to a conclusion that its fine. Please Help!
most probably its your fuel pump get it checked again, change the fuel filter inside it, when petrol is less the pump is not cooled enough and after a while the pump will get hot and it will start to miss.