for the past several months i have had code 45 coming up when im at cruising speeds. even sitting in the driveway if i rev it up to 2000 rpms if i hold it there for a couple minutes the code pops up again. i have checked all of my adjustments over and over again. i just cant figure it out. i have followed the flow chart that is in the old school chilton's manual and the results of that was that the code is intermittent. im completely lost with thing. can anyone help me?

 

and code 45 is........?

 

oops forgot that little piece of info. it means rich exhaust