Hi Ron,
Go here:
http://focustestchart.com/chart.html
You will find the instructions and a chart that you can print out at the bottom of the page to check your set up for back/front focus issues. This is not a cure, it is just a means of finding out how badly affected a camera body is with a given lens for focus issues.
Try it with all your lenses: some may be better "tuned" than others to your specific body.