I had the secondary air pump code so had the RCM rebuilt as well as replacing both the camshaft and crankshaft position sensor‘s and keeping the originals as spares. I also had all of the fluids and filters changed as well as new spark plugs, serpentine belt and a complete brake job. I thought I needed a blower motor resistor so I replace that as well but it seems my problem lies elsewhere. If you plan to keep the car long-term it is worth doing preventative maintenance. I do have several good spare parts and an empty wallet but that is better than ending up stranded somewhere with an even emptier Wallet.