AutoAssure
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Performance Issues

Stalling, lack of power, rough idle, or poor fuel economy.

Car stalls or dies

Urgent

Engine shuts off unexpectedly while driving or at idle.

Likely causes

  • radio_button_checkedFuel delivery problem
  • radio_button_checkedCrankshaft position sensor
  • radio_button_checkedIdle air control valve
  • radio_button_checkedBad spark plugs
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Our recommendation

Get diagnostics run. Stalling at speed is dangerous—have it inspected promptly.

Poor acceleration

Check soon

Car feels sluggish or lacks power when pressing the gas.

Likely causes

  • radio_button_checkedDirty air filter
  • radio_button_checkedClogged fuel filter
  • radio_button_checkedFailing mass airflow sensor
  • radio_button_checkedSpark plug wear
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Our recommendation

Start with basic maintenance—air filter and spark plugs. Then get a diagnostic scan.

Rough idle

Check soon

Engine shakes, vibrates, or runs unevenly when stopped.

Likely causes

  • radio_button_checkedDirty fuel injectors
  • radio_button_checkedVacuum leak
  • radio_button_checkedIgnition misfire
  • radio_button_checkedEGR valve
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Our recommendation

Get an OBD-II scan for misfire codes. Common fix is new spark plugs or coil packs.

Poor fuel economy

Low urgency

Getting significantly fewer miles per gallon than usual.

Likely causes

  • radio_button_checkedUnder-inflated tires
  • radio_button_checkedDirty air filter
  • radio_button_checkedO2 sensor fault
  • radio_button_checkedDriving habits
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Our recommendation

Check tire pressure, replace air filter, and get an OBD scan for sensor faults.

Car shaking at speed

Check soon

Vehicle vibrates or shakes, especially at highway speeds.

Likely causes

  • radio_button_checkedUnbalanced tires
  • radio_button_checkedBent wheel
  • radio_button_checkedWorn CV axle
  • radio_button_checkedLoose wheel lug nuts
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Our recommendation

Check lug nut torque first. Then get wheels balanced and rotated. Check CV axle if shaking is worse in turns.