P0306 2002 ford focus missing runnig rough

Question

2002 Ford focus missing running rough code PO306

Answer 1

Hi there,

This can be caused by bad plug or wire, as well as a faulty intake manifold gasket or fuel injector.

You should also check the hose at the pcv valve, they have been known to leak and may be the oroblem. If the car is misfireing I would also recheck the code since this model never came with a 6 cylinder engine.