Crank No Start

Prior to my current issue, I had my fuel pump replaced. A few days later while driving, when slowing down or stopping the car would shut off. I would crank it and it would either start immediately or crank briefly before starting. While stopped if I didn't put the car in gear n press gas and clutch it would die, jerking, trying to stay "alive". The last time I drove it when I pulled into the driveway it died again. Tried starting and now just cranks and no start. I have replaced the spark plugs, and the crankshaft sensor. Still nothing. I bought a new starter but was told it wasn't the starter. So we are still back at square one. Tested the battery and it is fine. Any help, please?