OK. All problems are over,turns out some how the guts of my cat went south.I didnt gut it. I couldnt find anything wrong so i finally took vehicle to chevy dealer for diagnostic, they said motor was running great,no ecm problems,fuel curve,ignition,etc,etc,but cat was bad. I was over 3.00 hc now im down to almost zero.The tech said its not uncommon for f-cars and trucks to run that high before the cat,Also he said an average he finds is two to three plus before the cat,if there is a problem it would be five to six,this guy is always off at school for smog,and has never steered me wrong before.What do you think? And how can some guys pass with no cat?
Mike

 

Humm luck. I have heard of some people running ISO Heat or some other alcohol in there fuel. Use 87 Oct not 90 or 92. Pray. Thats about it as far as I know. There is not a way to say you will pass. I know back awhile ago there was a talk about this so look through the old posts.