hello last night i bought audi 90 1993 quattaro when i was bring the car from one and half hour driving fast the car was going good but there was check engine light showing before when i bought the car when i reach near where i live i speed the car then the car start cloging and it was like the fuel is empty but there was fuel.when i left the accleration padel and pushed the padel again the car got the speed and after 5 seconds the car start cloging again so like this all the way home i did pump the padal and went through home so please can any one tell me what it could be what is the problem with my car?is it a fuel filter?