engine running rough

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engine running rough - 1/8/2008 2:33:30 PM    ussva Posts: 25 Joined: 10/4/2007 Status: offline I have a K2500 suburban with a 7.4 liter engine.  I initially thought I pumped some gas with water in it, (small town above ground tank) I added gas antifreeze and some fuel injector cleaner but nothing changed. I checked my plugs, they were ok, still gapped at .060, changed my air filter but still no change. There is no "check engine" warning light and sometimes it is slow to start, like it's not getting fuel? Any ideas? Post #: 1

RE: engine running rough - 1/8/2008 2:39:38 PM    ZX1100F1 Posts: 2429 Joined: 8/1/2006 Status: offline Fuel filter? Fuel pressure regulator? Dirty Injectors? (in reply to ussva) Post #: 2

RE: engine running rough - 1/8/2008 2:56:48 PM    ussva Posts: 25 Joined: 10/4/2007 Status: offline Bought a fuel filter, haven't changed it yet, might be that? (in reply to ZX1100F1) Post #: 3

RE: engine running rough - 1/8/2008 3:00:42 PM    ZX1100F1 Posts: 2429 Joined: 8/1/2006 Status: offline Fuel filter is the #1 cause. (in reply to ussva) Post #: 4

RE: engine running rough - 1/8/2008 3:11:21 PM    ussva Posts: 25 Joined: 10/4/2007 Status: offline Don't have a repair manual, is the fuel filter located on the frame close to the gas tank? (in reply to ZX1100F1) Post #: 5

RE: engine running rough - 1/8/2008 6:02:12 PM    ZX1100F1 Posts: 2429 Joined: 8/1/2006 Status: offline Inside frame rail under driver door. (in reply to ussva) Post #: 6

RE: engine running rough - 1/8/2008 6:32:17 PM    ussva Posts: 25 Joined: 10/4/2007 Status: offline Thanks for the info, I'll try the fuel filter, hopefully that works. Keep you posted. (in reply to ZX1100F1) Post #: 7

RE: engine running rough - 1/8/2008 6:37:28 PM    ZX1100F1 Posts: 2429 Joined: 8/1/2006 Status: offline Dump about six 12oz bottles of Techron fuel system cleaner in a full tank of fuel and run it until it is close to empty before refueling while you're at it, it'll make it feel like a new engine. http://www.chevron.com/products/ourfuels/prodserv/additives/tcp.aspx (in reply to ussva) Post #: 8

RE: engine running rough - 1/8/2008 6:50:53 PM    ussva Posts: 25 Joined: 10/4/2007 Status: offline I'll try that, thought of taking it to the local chevy dealer for a diagnostic but, labor and other charges! Thanks again. (in reply to ZX1100F1) Post #: 9

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