Sorento Misfire - no codes

2005 KIA SORENTO
173,000 MILES • 6 CYL • 4WD • AUTOMATIC
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LIZZARD
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It's an 2005 LX 4X4. Plugs and wire replaced approx 12,000 kms ago. All was well until about 3 weeks ago. It misfires but no codes show when scanned. Misfire is most evident when under load.

While driving to and from work, I ran a recorder (CRRecorders) which scans (and saves) at 2 second intervals looking for a drop in rpm etc.. - anything glaring which may indicate where the problem exists... nada

Any assistance is greatly appreciated.

Cheers
Here are some scan stats:
@idle
ST fuel trim B1 & B2 - 0.0
LT fuel trim B1 - 15.5, B2 13.3

IGN timing 10 - 12
MAF 3.69 g/s @ 800 rpm, 1.3v
ISC @47 Load@14 TPS@.76

There are two reading that I am not familiar with, I am assuming that they are KIA specific? ISC Real Time Adapt - 1, ISC Long Time Adapt - (-24)
Nov 17, 2010 at 1:10 PM
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WRENCHTECH
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According to your fuel trim data you have a lean condition. Eliminate all possibility of vacuum leaks and then I would do a pressure cleaning to the injectors. The cleaning may or may not do the trick even if the in injectors are at fault
Nov 17, 2010 at 1:17 PM
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WRENCHTECH
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If you have the ability to do an injector balance test, that may be a good idea.
Nov 17, 2010 at 1:18 PM
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