Engine performance loss symptom?
Loud engine knocking noise?
Seems to rev freely when stood (dare not drive it)

Exhaust emissions seem o.k!

Cannot determine as yet if it is a true engine knocking noise or injection misfire causing knocking noise symptom?????

Read a tech bulletin about this 2.4 Ford Puma engine stating that early engine numbers have sticking lower piston oil cooling jets at cold causing engine damage & wear.