Cant diagnose problem with my pontiac g6

2007 PONTIAC G6
155,060 MILES • 4 CYL • AUTOMATIC
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BRITBRATME
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I been having trouble with my Pontiac lately. It doesn't happen all the time, therefore no mechanic can actually diagnose it. So it happen again and I finally got a chance to record what it was doing and I have included the video attachment please help me. Ive been to 6 different mechanics and they all tell me different things because it doesn't happen when I'm at the shop so they can never be specific.

2007 pontiac g6: http://youtu.be/Y2Pty507bPE

2007 Pontiac G6 4 cylinder: http://youtu.be/VsHdktKtlEA
Sep 28, 2014 at 2:15 PM
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HMAC300
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try cleaning throttle plate on both sides as it looks to be surging clean iac hole as well with choke cleaner . then check for a air leak in duct work or grommets on engine. then check fuel pressure with a gauge might be a clogged filter causing that.
Sep 28, 2014 at 4:09 PM