Everything has been fine and I go out last night to crank the Tahoe and it won't start. It's seems like it's almost there but just won't turnover. Battery meter was between 9-14 so I tried to jump it and got the same thing. Lights, electronics, etc all work when the key is in the "on" position. Check engine and battery light are lit up on the dash now. Is it the starter? I'm a complete simpleton when it comes to vehicles so any help would be great! Btw, I have a 6.0L engine that was put in the Tahoe before I bought it. I know that'll matter when it comes to buying parts but maybe not with diagnosing the issue. Thanks!!