What causes a engine to spit and sputter while driving but the car idles fine?
dirt in the carburator, incorrect fuelling or ignition (i.e. spark) breaking down under load.
Check that fuel is getting through, fuel pressure & that injectors are spraying correctly, and that plugs are giving a good healthy blue spark. If spark is weak it could be plugs, leads, coil, distributor cap / rotor arm or a bad earth - check everything.
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