I have a Suburban with a 5.7L Vortec and is hard to start after sitting for a while. It takes maybe 12-15 long cranks to finally get started, and once it is started, it restarts just fine (like on errands and driving around town, to work and back during the day). Overnight, however, it will present the problem. I verified that my ignition coil is providing plenty of spark to the distributor (I verified), but I am getting no spark at all to any of the plug wires. What are the symptoms of a faulty pickup coil (inside the distributor) or is this more likely just an ignition maintenance thing where I just need to replace cap and rotor. Thanks.