Electronic Fuel Control: Testing: Notes
A malfunction in the EFC system may result in engine surge, hesitation, rough idle and/or poor fuel economy. Before making any tests, check all vacuum and electrical wiring for proper routing and connections, and check for exhaust and intake manifold leaks. If these are in order, testing may begin.
NOTE:
The Spark Control Computer controls ignition timing as well as air/fuel mixture. Before testing EFC system, perform spark control tests first.