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<DIV></DIV>OK, you guys have been a lot of help so far. but my bus is still running way rich and puffing black smoke....so far...new ecu, temp sensor, grounds, o2 sensor, cat, idle stabilizer.......checked: hall sender, distributor, lots and lots... BUT THE BUS STILL RUNS RICH....heres the weird thing....The bus is at a good mechanic in the area ( I have heard a lot of good things) and when he unplugs the MAF, the bus contrinues to run (shitty, but runs). The bus should stall , correct? Well, it doesn't. Does anyone have any more idea, I am going to go search the archives and see if I can come up with anything. Thanks a lot. JOHN<BR><BR><BR>John Cianci
<DIV></DIV>Research Assistant
<DIV></DIV>Department of Civil and Environmental Engineering
<DIV></DIV>Clarkson University
<DIV></DIV>315-268-3776
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