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Engine starts but won't accelerate

(1996 Geo Prizm)
in Cedar City, UT on January 25, 2010
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.
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Popular Answer
on January 25, 2010
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.
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