My Fiancée hopped into her CR-V and couldn't get the car to start. I hopped in and tried to start it, could get the car to turn over and fire but it struggled to get enough speed up. In the end I held down the accelerator while trying to start the car and finally got it to run. No check engine codes and no visible issues under hood. What possible problem could cause something like this? This is just a stock 2.4L CR-V. New spark plugs and fresh oil change less than 1000 miles ago.