As far as the engine concerns, check to see if they left any vacuum lines off. Also, has the check engine light come on? Finally, do you know if they used quality spark plug wires? I have seen new (cheap) ones arc when they were just put on.
As far as the fuel gauge, there really isn't anything they could have done to it. The float gauge is in the fuel tank.
Let me know about the engine.
Joe
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Tuesday, February 16th, 2010 AT 1:42 PM