[steve00s]

The first thing I would have done is take it back to the seller and inquired whether this was a problem that was existing at the time of purchase and not disclosed. If you had driven it around for a week or two before the problem that is one thing but if on the first stretch of road after driving off the lot it acts up I would be highly suspect. How did it drive when you test drove it before the purchase?

It could be a number of things causing the problem. If you are new to the vehicle I would take it in to a shop familiar with these cars for a diagnostic.