Pontiac 6000 Questions

my wiring harness fried in my 2004 pontiac montana. when I ...

my wiring harness fried in my 2004 pontiac montana. when I called gmc they said they haven't heard of this problem and they will not help with my product cause it is 7 yrs old and the miles are to high. yet after looking online i have found quite a few problems that are the same for the same van make and year. any idea on what i can do?

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i have a pontiac 6000 LE i lose power going up hills i put the gas padle to the floor but my car only gose about 5 to 10 miles pre hour up a hill what could cause it to do that and will it cost alot to fix it