Sometimes when i start it up & put in gear then accelerate and then let of the rpms jump around teally fast & at times it all most dies?

Hello, sounds like you have an engine performance issue that is causing some erratic running and driving performance. A thorough diagnostic test of the engine's performance is needed. Start by retrieving any diagnostic trouble codes that may have been set to determine if there are any clues there. Then, testing of your air intake, fuel delivery, ignition spark, emission controls and base engine timing and compression is needed. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops