First, has the fuel pressure been checked since the work was done? Have you checked for vacuum leaks (especially around the intake)? Has the check engine light come on? Finally, as far as the filler tube for the gas, I think I understand what you mean. If it has moved slightly, it shouldn't be a problem. Check to make sure it isn't loose. If it is tight, don't worry.
Let me know.
Friday, December 17th, 2010 AT 3:08 AM