[Bosco]

Problem first manifest itself as engine quitting intermittently - but would restart. Problem became more frequent, then finally wouldn't start except infrequently. Would only start when cold, then run for awhile, then RPMs fluctuate even though the throttle is not being manipulated.

Initial troubleshooting
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Fuel pressure checks at 31 psi.
Replaced spark plugs, wires, dist. cap and rotor.
Replaced air filter and fuel filter.
Checked plugs for spark - checks OK.
No cracks in the air inlet duct (replaced recently).
No observable cracks or damage to vacuum hoses in the EFI or smog systems.

The weird engine RPM fluctuation led me to believe that the EFI control unit (computer) was hosed. Wrong. Swapped computer and no change (except to my bank account).

Any ideas?