My kid's Taurus with the 3.0 engine has sudennly starterd skipping and the Autozone scanner read P0304 Cam Positioning Sensor with cam detector out most of the time. connectionds out sometimes and a possible timing belt/chain rarely. Sensor is $30 here , and I'm thinking of just going on and changing it out. Is this a complicated thing, willl I need special tools? , and can it be checked with a multimeter?