My '98 Accent has recently developed a starting issue. If I start it every day it turns over and starts up and runs fine like it should - starts after cranking after about 1 second. However if it sits for about 5 - 7 days it has a terrible time starting. It seems to catch on 1 or 2 cylinders and barely chugs along for about 5 - 7 seconds until it finally catches and then smooths out. I also have to keep the starter engaged during this time or it will just chug and die. after that it then starts normally with little cranking for the rest of the day. The plugs are firing fine (I took them out grounded them with plug wires attached and cranked engine and all 4 fire as they should) and it is getting gas (plugs are wet when removed after a cranking episode). Also tested the cam sensor by removing it from its mounting hole and doing the screwdriver test (waving back and forth near its end) and it is behaving as it should by going from 5V to 0V on the signal pin. It seems to forget everything about timing if it sits too long and has to figure timing out all over again if it sits for the 5 - 7 day period. Any thoughts on what this could be?