P0304 Ford - Escape XLT. What first?

Question

Just picked up this car with 145,000 miles. The engine light is on. The engine "chugs" at 40 mph and above and the engine light flashes. The code reads P0304. I guess it could be anything from a bad plug or wire/coil to an O2 sensor or catalytic converter to ??? Which should I try first? Is one more likely the probelm?

Answer 1

Hi there

I would start with the ignition coil. it's the most common issue with these to be honest. You can try swapping the #4 coil with the coil next to it and see if the misfire moves with it. if it does, then oyu know the coil is the problem.