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Hi Steve,
The reason you can't find anyone to clean gas injectors is they wouldn't have any business.* The 113 "injector" diagnosis has misled many of us. The code is really saying the computer ran out of ability to compensate for what could be a leaking or inoperative injector - or any other reason the oxygen sensor can't be made to see the correct mixture regardless of how long the pulse is to the injectors.
Don't buy injectors!!
Do fix any exhaust leaks. Get a solid head pipe. Do make sure your fuel pressure is OK and the regulator diaphragm is not leaking. Do suspect intake leaks, especially if you've not had your intake manifold gasket replaced in the last 1 or 2 hundred thousand miles. It is good that you've go new injector o-rings.
And as Bubba says, if you've still got the airbox functioning with a heated air duct from the exhaust manifold, fix it so the air is not heated all the time, and the NOx reading will be reduced.
Reset your computer (remove the 25A blade fuse for a moment) and run 10 miles or so, confirming a 111, before taking it for the test.
* I didn't mean to say no one does this - you can certainly mail them to race-oriented shops, but as a routine maintenance/repair, there's no demand.
--
Art Benstein near Baltimore
Some mistakes are too much fun to only make once.
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