I have a 1986 Ford ranger 2.3 i4, So when the engine is cold it works perfectly but after about 30 mins of driving it, it starts bucking especially when I floor it, I’m thinking it’s a fuel pump issue but not 100% positive and this model has 2 fuel pumps a low and high pressure (with the low pressure being located in the gas tank and the high pressure externally mounted under the cab) and if does happen to be a fuel pump issue which on would it most likely be? And is it possible that a EFI can have a vapor lock? I posted this before but didn’t get much help, hope y’all can!!!!