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I owned a couple of D-jet 140's in years past. (I really liked them) I never found any of the relays to give me trouble. Common problem areas CAN be things like:
Trigger points: There are two breakers in the base of the distributer as the other respondant noted. Each one triggers the signal to two cylinders' injectors, so if you ever experience a situation of two cylinders not firing, that's the first thing to check.
Manifold Air Pressure (MAP) sensor: It's mounted over the RH wheel wheel and senses vacuum info from the intake manifold, and through the use of a diaphragm tied to some electrical windings, informs the computer about how much load is on the engine. (The computer then adjust the injector open duration in order to control richness.) Sometimes the internal diaphragm starts to leak and throws the mixture WAY RICH.
Throttle Position switch: Mounted at the throttle plate, it provides info to the computer like - "the throttle is at idle", or "the driver just stomped on the gas pedal, give me an extra shot of fuel". Sometimes its internal contacts get dirty or worn, causing a sudden "jerk" at cruise speed that feels like you momentarily switched the ignition off and back on as quickly as you could.
Oh, and by the way - don't expect much more than about 21 MPG city, 25 highway.
Did you get a manual or auto trans?
Good luck with the car.
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