About once a week or so my Z will take a few tries to start im thinking fuel injectors. any other ideas? and the first start up of the day or if it has been sitting for a awhile it makes a loud screeching noise i know it has something to do with the A/C cause once it stops if i turn the A/C on it will start again but just not as loud. i dont know if i should just try to tighten the belt of if the bearings are wearing out in the pulley? and yes i searched for about an hour trying to find another post about this but couldnt!!!