I have a 2003 tahoe that I never even questioned if it was flex fuel. Today I found the original window sticker that says it is flex fuel. Does that mean it will use e85. Also, if so how does that effect my performance.
In Texas and the last couple of times the weather has been lower than 50 degrees in the morning my girl has had a rough idle. Just at idle, she runs just fine as I drive and after the engine warms up, she stops having issues. 5.3 2003 tahoe.
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