I have had a stumble or hesitation that comes on at 3500-4000 rpm on my 408 sb duster.
First the specs: 5.9L Dodge engine with stroker, 408 ci, 10.5 cr, Hughes hyd. roller cam 240I/242E, Eddy RPM airgap intake, Holley 870 street avenger (vacuum secondary). Accel distributor, Rev-n-nator ign...