The Cam Position Sensor definitely. Tell your uncle to have it looked at at Ford to find out if it's still original, or if it's the latest replacement. If it's the latest replacement part, it shouldn't cause any problems, as the CMP problem was due to a faulty and fragile early design. Coil packs are another, but this isn't as common... same thing... if they've been replaced with the newer replacement part, should be okay.

Erratic idling? Could be any number of things... MAF, IACV, etcetera... but most are easily fixed.