Today’s cars have an onboard computer diagnostics (OBD) system that continually analyses the status of the vehicle’s components. Therefore if you are experiencing problems such as excessive smoke coming from the exhaust, problems starting, stalling or increased fuel consumption It may be time to do some testing.
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When started, your engine should run smooth, without shaking or hesitation. If you feel that the engine is bucking or stumbling when accelerated, there is a problem.