My 89 CTD at first start-up of the day takes about 6-10 seconds, used to take 2-5. After reaching normal operating temp (190) it will go dead every now and then, usually when stopping, then taking 15-30 seconds to start. Does this 4-5 times a day. Use the truck to pull a trailer for my lawn service. Alot of in-town driving. Any thoughts or suggestions would be greatly appreciated.