89 camaro

Most likely either the chip in your key or the contacts in the ingition switch are worn. If the chip in the key is work the easiest fix may be a new key. If the ignition is worn you can either replace the switch with it's contacts, or follow the wire down, measher the resistance of the chip in the key and put a resister of the same value across the line coming from the key (cut the wire and put it across the wire coming up from the computer) to make it always think that the proper key is in place. Personally I would fix the problem just to keep things as close to original as possible.