recently my cars been having some problems regarding starting up. We took it to sears and had everything checked. Mechanics said that there is nothing wrong with the starter are alternator, and i went from a weak weatherhandler to a diehard gold battery which which has about 495 cranking power. Any idead on what the problem might be, or has anyone else had this problem when they swap a different motor in their car? Any help would be appreciated. thank you.