My truck has started to blow black coming off idle or off cruising when I punch it. It runs good, smooth no misses, 25 lbs boost,new oil, new fuel filter, just a little slower when starting because it's not burning the fuel. does it on all chip settings, maybe a little on stock. hooked up scan gauge and put in 7.3 settings,at idle icp 500-530, ipr 13.71, ebp 14.1, map13.1, but the fwt reads -40. The gauge on dash goes up. Is there a different sensor for the computer ? Where to start?
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