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Message: <blockquote data-quote="BleedinBowties" data-source="post: 26362" data-attributes="member: 6203">Hello all,I'm a bit stymied with a problem in my 2006 1500 W/T with a 4.3L.  This is the old 4.3 before the new engine series, an LU3 I believe, with about 170K on the clock.  It began running a little rough a couple of weeks ago.  I knew the plugs needed replaced (pretty sure they were the originals because the upper electrodes were basically gone) so I began with that before I every put my OBD2 scanner on it.  At the same time I replaced most (4 or 6) plug wires.  Yes I need to replace the other 2 but I don't think that will fix my issue.  At the same time I replaced the EVAP purge valve because I broke it while crawling around under the hood.  I fired the truck up and it seemed better but still running rough.  This time I checked the OBD2 and it was giving me a P0200 which  indicates an injector circuit malfunction.  I cleared codes several times and rescanned and am only getting that code.  I checked wiring under the hood, can't find anything loose or broken but that doesn't mean there isn't something under there.  I feel like leaning towards the spider injector being bad, but I don't want to through parts at it willy-nilly, and thats alot  of work if it's not bad.  I have a set of NOID lights on the way to help me diagnose that area, but if my thinking is correct then all those will tell me is if the signal from the PCM is bad, right?  I do need to crawl under and change those plug wires and check grounds, etc, but those things not withstanding, I guess I'm looking for help on the diagnosis side.  Is there any way to check injector integrity without tearing out the spider?  I can't see one.   Any help would be greatly appreciated.</blockquote>