Last week I replaced my fuel pump after a surging issue. Then we had 3 rainy days that had the car being hard to start, which I attributed to a loose distributor cap. Yesterday before I had a chance to look at it the car started only going 25-30 mph and if I tried to push it it'd backfire out the tail pipe. Today I got time to look at it and the cap was loose. tightened it and no effect. So I got a new cap and rotor and even swapped in a different HEP. still no better. Any ideas?