When I am driving, pop it into neutral and then back into drive when the car is in 4th gear....the engine rpms go way up and the car jerks forward, as I suppose it shifts down to 3rd before going back up into 4th...

It happens at any speed as long as its in 4th.

Is this supposed to happen? Or should it go right back to 4th out of neutral?

Thanks

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k