Bob 25th TA

I have a 94 TA with 85000 miles on it that is knocking and bogging down when accelerating under load. It seems like the drivers side cylinders are cause of knock. I have taken a freescan sample and can see the knock count go up dramatically when this happens and timing retards to 1deg. Is there anyway to tell if this is an optispark problem or can anyone analyze Freescan readings?