gettin fuel , spark ,oil good i was on the highway doin bout 40 tranny wouldnt shift so i reved it a few times it lost power n died i stoped cranked it started went to 1500 rpm by itself n turned off real fast i staretewd agian same thing then after that it would nt run jus crank crank ??? things to check sommetimes this has happened before n it cranked after a while its a 90 cherokee sport auto 4x4 regualar 4.0