Yea the computer definetally should store the codes....Are you sure your waiting long enough? It will flash 12 x 3 times announcing start of the test. Then it will flash each of your codes 3 times after that and then it will flash 12 x 3 times again as the end of the test.

 

Run premium fuel and your troubles will disappear.......It even states in the manual to run nothing but premium (92+) in your motor.

You have a sports car/ muscle car......You have to pay to play.

Later

 

Can I check the codes while the engine is running???

 

I don't think that is the answer. Looks more like a band-aid solution to me. LB9 and L98 which are both TPI 305 and 350 respectively require premium unleaded while LO3 which is the non-TPI 305 requires 87 octane. So, you need to find out what is causing it instead of just dumping premium fuel and band-aid the problem. This is per the owner's manual.

 

Well driving around tonight in the rain the rattling wasn't as bad. It was also colder out. I really think this might be just exhaust but I am gonna check my timing out anyway. Thanx for all the help guys.

 

Well I have a new thought on what this might be. Today I was driving around kinda hard and the rattle started then my check engine light came on. When I pulled into my driveway I got out and just listened at different parts around my car. Well right by the cat it sounded like the car does after you turn it off and it is cooling down. That metal shrinking time sound except the car was still running. Could it be stuff inside my cat breaking up??? I don't think that cat has ever been replaced.