Knock retard...you don't want none of that business, but the more factory the car is...the less destructive it tends to be.

Really the main thing.

I also check LTFT's...if they're pegged at 16.4 then you've got a vacuum leak.

Just take it out and do a full bore run, get it into 3rd gear, because the top of second gear is where knock occurs most of the time; or whenever there is a good amount of load on the motor...like 3rd or 4th gear too.