Need some help I have an 89 5.0 lx most of the usual mods I have installed the 3g upgrade I have underdrive pullies anyway car is fine till I switch on the ac or headlights after that it will stall or idle quality is very poor. alternator is putting out 14.7 at idle and around 13.5 with ac on the tps is set at.98 everything has been cleaned and adjusted I am pulling my hair out