It's a 740 turbo

I'll check all the suggestions. I should also give more info on the car it's a 89 wagon. I Did drive it home and it would randomly get power and take off but 90 % of the time it didint like driving

Hello I just bought a Volvo 740 the car runs and idles fine but the moment I put it into gear and put the engine or load it has no power it tries to stall but won't stall I've drained the fuel tank since there was rotten fuel in it and put fresh fuel in I'm thinking the fuel pump might be bad and th...