Got a customer that dropped off a 1997 1/2 ton that he rebuilt the motor on and installed a "Thumper" cam. Bad choice on his part but I am trying to get it to idle and run halfway descent. My issue is at an idle it suddenly starts pulling timing and it gets down to about 0 advance. My target is around 28. What conditions will pull that much timing at an idle? He says that the oil pressure guage is wrong because when it warms up it drops to 5 psi and the check guages light comes on. Will this do it?

Thanks
Mike