Small Engines (Lawn Mowers, etc.): Troybilt super bronco, bearer of bad news, drive belts

Question
mower keeps jerking while driving,about every 5 seonds what do i need to check?

Answer
Sorry to be the bearer of bad news, but, the Super Bronco is the cheapest and possibly the worst mower ever made. You may not ever be able to stop the jerkiness. Sorry, you got what you paid for.
All you can really do is check that the drive belts are in good shape. Hopefully they're not and you can replace them to solve the problem.