IIS7 ASP.net 2.0

Number of worker processes growing out of control in single app pool. Appear to keep spawning upwards.

Monitoring the w3wp.exe process i can see "current connections" to web service sometimes spawn out of control but not always , only worker processes are consistently growing when this issue occurs.

Number of worker processes normally 0 - 20 , when spawning they can reach 1000 +

This was deployed in:

%windir%\Microsoft.NET\Framework64\v2.0.50727\aspnet.config

  maxConcurrentRequestsPerCPU="50000" 
  maxConcurrentThreadsPerCPU="0" 
  requestQueueLimit="50000"

But issue still occurs.

Have tried running PROCDUMP on the exe process but the mini dump isnt a great help.

I understand this is 99% probable an app issue , what i need help with is tracking it down.

Thank you for any tips. Scott