We just bought a 2001 focus coupe with the single overhead cam 2.0. It had a rough idle when we bought it so I went through and replaced the plugs, wires, fuel filter, air filter, trans mission fluid and filter, oil and filter. Then a couple days later it dies not far from home. Tow it back and find out it didn't have spark on two of the cylinders. I changed out the coil and it ran perfect. Idled smooth had good acceleration, ran great. Fast forward a few days. We try to start it today and it cranks fine but only fires for about a second every two or three seconds. It's like if you had a car with a cap and rotor and unplugged all the wires except one. It will fire (for a second) at the exact same spot or time if you were timing it. I'm lost here. Any suggestions?