Roper gas range and oven with electric ign...

First look to see if the ignitor is coming on. Most common problem is the ignitor is weak or just bad. When the power is applied to the ignitor it glows and builds up resistance to open the gas valve then it lights. If the ignitor is weak or bad it will not build up enough resistance for gas to come into the burner. One sign of this would be a "woosh" sound when it trys to light. If the ignitor is coming on but not lighting it is most likely the ignitor is bad. Should have a full glow. Also, if the ignitor looks whiteish in color this is a sign of it going bad. You can compare to the broil ignitor to be sure. If the ignitor doesn't come on at all will need to see if you have power to the ignitor. Let me know what you find and let's solve it before you rate the solution.