2012 Mazda5 AT. It has been running fine up till now. It started when it was about 1/4 tank of gas and filled up at a station in the city. shortly after it started bucking/ stuttering and when i come to a stop it would stall. so at this point i am thinking bad gas or fuel pump (original fuel pump) no codes. so i replaced the fuel pump (delphi brand) and replaced the gas and no change. at first when cold it would idle ok but once warmed up it would hesitate and stall even if i try to idle it at ~3000 rpm's.
Eventually I did get a P0300 so i replaced the plugs and swapped out coils and injectors with known good and cleared codes. again no change and no codes. on top of that it seems like it doesnt matter if its hot or cold. looking at live data rpm's, coolant temp sensor, STFT is about -5 but to me everything looks normal. i am at a lost with the lack of info.
Any help would be greatly appreciated.
Eventually I did get a P0300 so i replaced the plugs and swapped out coils and injectors with known good and cleared codes. again no change and no codes. on top of that it seems like it doesnt matter if its hot or cold. looking at live data rpm's, coolant temp sensor, STFT is about -5 but to me everything looks normal. i am at a lost with the lack of info.
Any help would be greatly appreciated.
