The car is a 00 Ford Taurus 3.0 flex fuel. 84,000 miles.

Bought the car about 6 months ago and it ran great. It was a well taken care of car. When I started to use it it ran great all the time but then I noticed that if you didn't warm it up it would have a miss, but no engine light. Then it started to miss when you got stuck in traffic. On the open road it runs great just misses in traffic. Now the engine light will either blink or come on solid with a code 0301. If I put Sea Foam in the tank it will clear up and run great even in traffic. I can drive it long enough for it to pass state inspection and set all the monitors. One day the car will run great and the next it will misfire. I took the plenum off to replace the number 1 injector. I am also changing the plus and wires. They were original. It sounds like a dirty injector or one that isn't working right.

I still have the car apart waiting for an injector I ordered. Any thing else that could be wrong. Maybe someone had a similar problem and could help. If these changes don't fix it I will change the coil pack, as that is still original.