Cannot start our 04 Avalanche. It was acting difficult to start, code said faulty MAF, replaced that and now cannot start at all. The starter cranks for only a couple of seconds and then you have to cycle the key to get the starter to crank again. Not sure what to do now. Previous to this it let us down by losing power and just barely made it home the last time out. Have been reading up on all the problems others have encountered with this problem but haven't seen anything about this starter problem. Battery tests good and fully charged. Thanks for any suggestions.