When leaving for work this morning my 99 cherokee with a straight six andauto trans was miising n popping. i shifted to neautral n it reved up fine, dropped back in drive n went on to work with just a couple hickups after that. Then, on way home it did same thing but when it gets warmed up runs good. idedas? maybe a tune up will help? also the windshield washer stopt squierting on windshild, wipers still make two passes but no fluid?