As the symptoms change!!!! <img src="/forums/images/graemlins/barf.gif" alt="" /> (Kinda sounds like a soap opera doesn't it???? <img src="/forums/images/graemlins/rolleyes.gif" alt="" /> Ok I'm pretty sure it got worse which is good. IT seems like it's missing all the time now, not just ona idle (ona???? <img src="/forums/images/graemlins/notooth.gif" alt="" /> must be a new term!!!) It misses when the A/C compressor cuts on, something it didn't seem to do before and on the road I can hear it and feel it under light throttle. A friend suggested that the cap might be cracked, even though it only has 10,000 miles on it. So, off to Advanced auto parts I go today (it's their grand opening, I figure I'll give them a run for their money and see just how much stuff they have in stock for Isuzus!!!) <img src="/forums/images/graemlins/grin.gif" alt="" /> I'll let you know what happens. But as far as the black smoke, I might still have an injector problem, or a sensor, so I might try an O2 sensor too while I'm at it. Thanks for all the suggestion!!! <img src="/forums/images/graemlins/kewl.gif" alt="" /> <img src="/forums/images/graemlins/cheers.gif" alt="" /> Dave