Changed Spark Plugs and now a puffing sound

[milesmc214]

I am posting this thread for MIKE MikeInd. He dose not have internet access at home so I am posting this question for him.

He Changed his spark plugs on the passenger side of the engine. He used Denso Iridium plugs. He only changed the 3 on the passenger side for now, He will be changing the other side tomorrow.

After he changed the plugs, he started to hear a puffing noise that sounds like it is internal, He only noticed this noise after he changed the plugs. The only way he could explain the noise is that it sound ed like a puff..puff..puff. He wanted me to post and see if any one knew what the problem or noise could be. He will be looking at this thread tomorrow when he has access to the internet.