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Just read all of this and seems I have exactly the same problem then..

cars very jerky at 100km when running at 2.5k - its a series 1 rs4 on 150k has odd front to back tyres - new pair to the rear a month before I bought it and new pair up front just last week for roadworthy and registration..

only noticed it yesterday on its first freeway run in a week and its very hesitent, thats another 220 bucks on tyres then!

already picked up fuel and air filters and have new plugs to go in and contact cleaner to sort out the AFM just incase

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Just finished work and went to check tyre pressures both fronts ( new tyres ) on 34 psi rears ( month old different brand same size ) left 33 right 35.

Balanced all 4 to 33psi and took it for a blast.. Issue fixed and no shudder at all :)

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