Car was running fine after replacing fuel pump for a week then driving down road all of a sudden i it starts running really rough so ipulled into gas station and before i could even put car in park it died it started but if i didnt push the gas it would just die again the whole car shaking when it starts but wont stay running without pushing gas petal and has no power when driving down road, please this is my only car and if you could give me a walk through on how to fix it or what might be wrong and where part is located that might be having troubles i dont have any money to pay for a mechanic and i would muchly appriciate it