Hello i am trying to change my spark plugs in this vehicle. The issues that I am having with the vehicle is that when I go to drive it in the morning even in warm weather the speedometer doesn’t move until I hit the 2nd or 3rd gear and it’s sort of sluggish starting off. Then when I’m on the interstate my vehicle starts to jerk at 60+ mph and when I have the ac on it jerks at 40 mph. I am hoping it’s just the spark plugs and if it is would someone have a comprehensive guide on changing them?