It could be many things! One could be the module as stated above. An other one could be a bad(carboned up) EGR valve that will allow it to start and then die when you try to drive. Depending what carb it has,it could be a blown power valve.
When is the last time you did a full tune up and inspected your spark plugs as well for flushed your engine? a bad air filter can choke out your engine.... depending on how the filter box is made on my ol 89 f-250 when i first got it it had a start then fail problem which come to find out was nothing but needed a oil change and a airfilter change there was motor oil all in the filter box when i got it which choked it out.
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