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pvtcook 02-06-2008, 05:30 PM 99 Tahoe 5.7. No check engine light. Started running rough at idle (only at idle) Looking in the mirror I can see black smoke coming from exhaust. What could this be? Thanks j cAT 02-07-2008, 05:05 PM 99 Tahoe 5.7. No check engine light. Started running rough at idle (only at idle) Looking in the mirror I can see black smoke coming from exhaust. What could this be? Thanks a bad injector is very possible remove plugs see if all or just one cyl. 2000CAYukon 02-08-2008, 12:20 AM A leaking fuel pressure regulator or high fuel pressure can also be the problem. //2000CAYukon vBulletin®, Copyright ©2009, Jelsoft Enterprises Ltd.
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