Hi, just got this car from mom, been driving it so far no trouble. it has 155,000 miles on it. Today when getting on the freeway, I got on it really hard, then the engine light came on...Use a code reader from WalMart and got a code 41...Have noticed a few times over the last few weeks when starting first time in morning, it stumbles then picks up, not sure if that is related to this, but may be a symptom of the problem causing the code. Has anyone had this problem, know what I should look at first. The book lists a few different issues, so not sure which one to start with...Thanks in advance for your help...Also, anyone know where to find the CAM sensor?