"Attention Pushrod" - My Car had a code P0340 and now the changed to P0343 What do I do?

Thank you Sir, I appreciate your immediate attention. You told me what I needed to know. The Chevy dealership wanted me to have it towed to their place $150.00, $600.00 to look at it, and $1500.00 for the computer depending on which one it was. That seemed high to me.Thank you anyway.

You don't have to get the dealer to do this! .. Any qualified auto repair facility should be able to sort it out.. It just requires hand-on testing, with a plan of attack!

Thank you, Pushrod, I know the dealership will be more costly.