Popping in sprinkler head

I have a head in line with 4 other heads. It's in the middle. When the sprinkler system turns on, this head "pops" like it's getting rid of air. It's the only one that does it. Could I have a leak or break just before or at this sprinkler head? I took the head off and it's clean.
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Does no water come out, does water come out with complete head removed. If water comes out with head removed and you can see into the pipe its the head
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m Ransley wrote:

Water comes out with the head both on or off.
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If water comes out after the air it is the high point and is just venting the last of the air, if you had a leak you would have no or little pressure since they are inline. I only worry if water output is reduced.
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