my 94 idit starts fast in the morning o in winter time but for some reaseon in the summer time when its ubove 70 outside and if i drive it for a while and stop and grab something from a store and go back out after about 5 or 10 minutes the complete glow plug system does not work and its hard to start it take about 3 trys to get it started but if the wts light works it starts fine