I don't think you need a high torque starter, your engine is stock so a stock starter should be adequate, First thing on your starter is check to make sure you have a good ground to your starter, and make sure you have a good battery cable between the positive post and the starter and they both are of adequate size. If that doesn't cure it and you are unsure how to test it remove it and take it to Oreilly or Autozone etc and have it checked before shucking out bucks for something that might not need replaced. My two cents worth..