There are several items that can cause that condition. The most common items are the distributor, ignition module or even the ignition switch. It is usually rather easy to diagnose especially if the condition happens when we are diagnosing it. We would be more than happy to check out your vehicle for you if you would like. Just give us a call and set up an appointment. I hope this helps.
Steve Bazar Your Car Specialists 562-802-1332 YourCarSpecialists.com