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Check the alignment first!! I went with the Pfadt Street Alignment specs when I put on my new tires and the car drives great!!
If that doesn't fix it and there are no bad or worn suspension parts you could have a tire separation issue. On my 08 Pace car, before I changed my tires and had it aligned it was all over the place. The tire shop told me that on of the front tires the tread was separating from the ply’s. They said they could tell by the way the tire looked when they deflated it. They said that would have caused it to wander all over the road......
Are you sure it was not in a bad accident?
The reason I ask is you say it has 36000 miles and not one paint chip.I think this would be unusual on the original paint.It could be it was put for sale right after it was repaired and it was not repaired correctly.
36k Vettes should have paint chips, I agree it might have been in an accident. 19/20s? What else did he mod? Unfortunately you might be stuck fixing it or living with it. Get a good alignment shop to look at it as mentioned above. 19/20s will wander more though. Did he mention a tune? If so or if it does have one, you might not have any warranty.
Ok I hope I did this right . trying to multi post to everyone that answered my post . got the four wheel alignment and tires balanced . took care or those issues . the avic-x920 problem was a bose interface box that was bad causing no sound ,everything would function but no sound . its fixed also . thanks to all who helped I really appreciate it . have a good weekend .
What do you mean by wander? Have you driven other vettes (wide tires trammel)? Any vette will want fishtail if you floor it. Getting alignment checked as others have suggested is good start. Have suspension checked for loose joints etc.
You usually have to go thru hell before lemon law applies.
I agree, if he had a custom alignment done with more negative camber than stock then the car will corner much better but wander.
Ok I hope I did this right . trying to multi post to everyone that answered my post . got the four wheel alignment and tires balanced . took care or those issues . the avic-x920 problem was a bose interface box that was bad causing no sound ,everything would function but no sound . its fixed also . thanks to all who helped I really appreciate it . have a good weekend .