OK, a few things to check:
Is it blowing smoke? If so, when?
Is the oil white?
Is there oily scum on the water in the coolant bottle?
Does the car misfire?
When was the fuel filter last changed?
Done the timing at all recently?
Proud TQE Operator and President of SEFAG - the Society for the Elimination of Ford Automatic Gearboxes
Pacemaker headers + 2.5" exhaust
EF Fairmont interior
Lowered King springs
5 speed manual
Newest mod: EF Ghia wiring loom and dash