Can you still have blocked arteries, even if your cholesterol, triglycerides, and blood pressure are good?

Yes. The causes of atherosclerosis are multifactorial- high cholesterol is just one factor. So yes, it is possible to have normal cholesterol and still have blocked arteries.
Yes. While lipid levels and blood pressure are important, many other factors including genetics, tobacco abuse, diabetes, etc. Contribute to artery plaques. In addition, blockages can be caused by compression of the artery by abnormal bone, tendons, muscles or tumors.