I would suggest you get a subscription to ALLDATADIY.com it will come in handy on showing you how to get to the ignition switch. Alldata is what alot of dealerships use to work on cars. It's pretty cheap too for a year per car is 18ish if you google a coupon code via retailmenot.com

Check all of your ground and power wires for corroding, cracks, ect. Replace as needed. This mod is also known as the big 3 if you are wanting to google and do that upgrade.