From your description, it sounds suspiciously like the MAF or dodgy fuel. Could also be a vacuum hose off somewhere, a split in the hose between the MAF and the main air intake to the throttle body - in fact one of several possible causes.
However, you've given yourself a huge headache already by throwing parts at it. Sometimes even new parts can be faulty and cause similar symptoms.
As we have to start somewhere, what are the plugs like, what is their gap and when were they last changed? What about the HT leads?
Was it running ok before this happened and did it do anything strange befre it happened? Did it just die or was it that you came out one day and it wouldn't start?
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Cheers
Dave
Next Door to Top-Gun with a Honda CR-V & S Type Jag  Volvo gone but not forgotten........
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