Strip the car down to bare chassis, lay chassis on setup board or glass. Check the straightness of the chassis for twist and bow. The chances are if you have had a good whack that could be it. If the chassis is good, check suspension for binding. Make sure the pivot balls are free, put equal sized tires on the car (left and right equal). shock length should be even, and then put the car on the tweak board with bars disconnected. set tweak, then you can attach bars, there shouldn't be preload in the bars. Also make sure shock shafts aren't bent causing bind.
Hope this helps.
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