It is the selonoid on the fenderwell.
I had this too.
Then it did it again a week later...so get 2 to be safe..they are small and cheap..might as well have an extra.
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4.10's,long tubes & 75 shot...Goes 12.50's
Check it out at
http://www.burnouts.webprovider.com
11's coming soon!!!!
Heads,intake and cam are all here