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Yes a bad ignition switch will cause intermittent start problems. If its original I would replace it they tend to wear out. To check for a faulty fuel pump let it sit overnight, and check fuel pressure. If it has no fuel pressure its got a bad check valve in the fuel pump. It should hold...

Check your ignition switch that is under the dash to make sure its still tight. The nylon housing that is pressed into the metal sometimes comes loose which causes random problems. If its original replace it, also had good results with borg warner part. Matt

Will a cracked carbon canister create a pretty big vacumn leak? Its with a 91 mustang it looks like it has a check valve that comes off the manifold going to a check valve and then to the carbon canister which has a huge chunk missing out of it. Probably causing my rough idle? Thanks...