i have been trying to find things out but i cant find my exact problem on the internet. its an 86 ram 150 318 4x4 with 4 speed. i switched cams. brand new carb and intake. hei style dis. with 8mm wires and accel coil with new plugs. trucks runs fine at idle through 4000 rpm but over 4000 it falls on its face and has a weird idle after in neutral and to shift and keep going it stays. if i rev the motor a few times it goes away. no cat, no intake leak, timing seems fine what could it be? lean burn crap is all gone also