Just got my 99 tibby having issue don't kno wha it is. When I'm driving it and hit it gas a little the rpms r going up but the mph doesn't move, then it accelerates. Kinda feel like it lags. Its hard to explain. Doesn't happen all the time. Dont kno if this would have anything to do wit it but the check engine light is on and wha came up was "P0441 evap emisson control system purge flow fault" new to hyundais so please any help. Thanks