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Delco Electronics had been supplying all GM automobiles sold in the USA with Engine Control Modules ( ECMs ) since 1981 when the USA Clean Air Act required 3-way catalytic converters and controlled air-fuel ratio s. The production ECMs were becoming more complex , and were becoming powertrain controllers controlling the transmission , spark timing , Idle speed , as well as air-fuel intake mixtures .
 Delco Electronics
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Delco Electronics