Start with simple things as follows:
a) New air filter if the one you have now is old or looks clogged at all.
b) New fuel filter if it hasn't been replaced recently.
c) Check tightness of earth screw (rearmost closest to engine) on the distributors TFI module.
d) Check for loose/leaking vacuum hoses.
e) Clean and retighten battery connections and battery earth on engine (EEC might be relearning after each start).
f) Read the self diagnostic codes; see http://www.autoemf.com.au/ford.htm
g) Sticking throttle butterfly (espcially if you are using an after market oil filled air filter).
h) Blocked exhaust pipe or cat converter (hit a kerb and crushed it?)
i) Dirt in fuel (should see this in the old fuel filter if you replace it).
j) Dirty injectors (try adding some fuel injector cleaner to the fuel tank).
k) Moisture or corrosion in TFI plug on distributor.
l)Cracked distributor cap.
m) Failed PCV valve.
n) Leaking rocker cover oil filler cap or gasket (sucking air).
o) Fuel line leak.
p) failed fuel cap valve.