Its very difficult to help answer a question like this when anything in the front end may cause a pull and even some things in the rear end may cause your car to drive crooked. Sometimes the problems are related.

Has the front end been checked for worn parts? Pushing and pulling the tire at 12 & 6, 3 & 9 o'clock ? Have the bushings and upper controls been checked for wear? Have the tires been swapped side to side (tires can pull very badly) ?

Throwing parts at a problem is frustrating.

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Brian Toscano