The symptoms you are describing would occur if the front wheels were towing out too much, as one wheel encounters a seurface with less grip, the wheel with the best grip pulls the car out of line for the duration, till you correct that naturally, and then when the grips again equalise you have to snatch it back....that sound right?

Other possibles are caster might be out, but we're into specialist measuring here and should only be out if the car has been damaged in some way, but its probably one side and to produce the effects you describe might well be measurable witha tape measure, so check each side yourself, wheelbase too (front wheel centre to rear wheel centre)...does the car steer straight ahead if you let go of the wheel or does it pull to one side, thats a clue.

Don't forget the rear can have more effect than some think, so that alignment needs checking too, presumably all suspension bushes and joints have been checked carefully thorughout the whole car.

Also it can be interesting to get an assistant to drive your car on quiet roads and you follow in another car and watch how it behaves, paying particular attention to how the wheels and suspension operate over undulations, also look for crabbing (car going down the road slightly sideways, indicating the rear axle is out of true..

Try swapping front and rear wheels, and whilst you have the rear wheels up, spin the wheels and check for buckled wheels or distorted tyres.

Good point that Rob.

edit....arrgh, my glaring error which now glows like a neon sign with big finger pointing at it...toeing, not towing, schoolboy error...head hung in shame..:-).

Edited by gordonbennet on 14/07/2014 at 10:37

We put that down to autocorrect GB, you should have kept quiet.

My only mitigation M'lud, still partly asleep, back ache waking me early again, and after being on shift all weekend too, poor old thing get the violins out..:-)

Thanks for answering regarding the wheels : you'd be amazed at the number of people who complain that their steering/handling has gone to hell, only to (eventually) reveal that they've fitted monster bling alloys shod with rubber bands. However, we can rule out the wheel size in this case now.

As you seem to have had all the wheel alignment/suspension checks done, the only real thing I can think of to check would be the steering. If the car has been in a crash on the front end, then rack parts, rods, etc could be bent.