Hi Folks I got 5.7 hemi that is misfiring on # 5 cylinder only at high rpms and cruises speed .

Its not the plugs ,coil pack or injector all new I even moved them all to #3 cylinder and still comes up #5. Compression is the same in all cylinders at 175 psi 90,000 miles on it any Ideas? I heard that it might be a lifter problem but there is no ticking.
Kevin