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Ok i finally completed my bp swap in my 93 festi and it runs a bit harsh. it will pop while accelerating which means some of the gas isnt burnt so its going out the exhaust what are some diagnoses for this? I also wanted to know when i should shift because i got the transmissions mixed up at a pull it your self when the guy told me it was a 5speed but it was really a 4speed and i dont have a rpm gauge yet. so at what speed should i shift until i get an rpm gauge?