My girl accidentally put diesel in the truck instead of gas, so the engine was stalling out. GG auto charged 160 for "diagnostic" and Alex checked everything out. When we talked he said the gas smelled a little like diesel and white smoke from exhaust... it was most likely thing. So after checking the engine in a few ways, and checking that the fuel pump had pressure, he drained the gas and put a few gallons of regular gas in. Started and ran fine. Charged me $550 . I feel like I was overcharged. Not going back there again.