I have an '87 blazer with a TBI 350. For the past week it has been acting like my motor has a holley carb on it! Every bump that I hit or steeper hill that I climb, the motor will stutter like it is running out of gas. The thing is, I have a full tank of gas. I changed the fuel filter to no avail. Is this a sign of the in-tank fuel pump going out? Maybe something wrong with the injectors? Please help, this is my daily driver and I know little about fuel injection.