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Engine starts but won't accelerate on 1996 Geo Prizm

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The engine quit without warning on the freeway and now will start and idle but dies as soon as the accelerator is pressed. Diagnostic code shows a bad ignition module and main computer but replacing them makes no difference. We have had it to two different shops and both are stumped. The original engine blew a head gasket and was replaced with a lower mileage but identical engine about six month ago. Compression, plugs, etc. all check out OK.
(1) Answer
How good is your fuel pressure? I would check that first with a really good gauge set. Then I would make sure the Throttle Position Sensor is working and I would use a lab scope to do it.