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Re: 95 sub 5.7 tbi
Black smoke means you are running rich. 1st thing to check in the engine coolant temp sensor (in the intake manifold near the tstat housing). If you have a scanner, you should see what temp it is reporting to the ECM.
The exhaust heat riser should be closed when the engine is hot. On my 90, it stopped working a few years ago and I wired it closed since I don't live in a real cold climate.
//2000CAYukon
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