Try airpush detector. It should find the app that is causing the problem.
It worked great on my phone but my not on my dad's. My nephews downloaded a bunch of games on his phone and one or two of then were causing the problem. I just uninstalled them all and the problem went away.
Cingular 8125 - Collecting dust
My first Rom upgrade to WM 6.1 (9/1/08)
iPhone 3gs Wife was using it on T-Mobile, but it didn't survive a dunk in the toilet
iPhone 4 - Returned because it was a POS
Samsung Captivate Slim Bean - Wife was using it on StraightTalk
Samsung I777 - Galaxy SII Slim Bean 4.2
Samsung Galaxy S4 I337
Let's Play v2.1
Acer Iconia A500
Honeylicious 3.2.1 Flash Glass