Engine Miss

• Many times, a vehicle with a leaking intake manifold experiences an engine miss, or an irregular engine cycle. A leaky intake manifold allows intake gases (air and fuel) to leak out into the outside air, disrupting normal engine combustion, which leads to an engine miss.
  
  

Engine Noise

• A leaking intake manifold allows engine intake gases to escape during engine operation.These escaping gases, which are traveling at very high speeds, can be heard as loud hissing sounds as they leak out of a leaky intake manifold.
  
  

Engine Hesitation

• By interfering with the amount of air/fuel mixture that reaches a vehicle's engine, a leaking intake manifold negatively impacts engine combustion and power. This can cause a vehicle to hesitate or stumble, especially upon acceleration from a stop.
  
  

Low Engine Power

• It's common for a vehicle with a leaky intake manifold to experience reduced engine power. This is due to the amount of air/fuel mixture that escapes from the leaky section of intake manifold. The wasted air/fuel mixture gases impedes engine combustion, which in turn causes a power loss.
  
  

Hard Starting Condition

• A leaky intake manifold can make a car hard to start. By allowing a large portion of the air/fuel mixture to escape rather than enter the engine, a leaky intake manifold prevents normal engine combustion from occurring, which in turn affects vehicle starting, especially a vehicle that has been sitting for long periods of time.