One more thing. I don't know if this would be related to emissions or not. When I set the cruise and run down the highway, it feels like the cruise cuts out. It did it 3 times yesterday over about 25 miles. Its not the transmission shifting, its like the cruise shuts off and then re-engages. What would that be?
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1987 GMC 1500 5.7L
1985 Chevy 3/4 4X4
2001 Chevy 2500 HD 4X4
2007 Chevy 3500 Duramax 4X4
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