Grand Cherokee 2005 Overland 4.7 HO. The engine was running ok I stopped for 2mins or so and it would not restart diagnostics pointed to the crankshaft sensor which was replaced yesterday and everything seemed fine, I drove for 12 miles this morning, stopped for 10 mins or so and it would not restart, I tried it again after 30mins and it did start but the idle speed was very erratic I switched off and tried to restart but it didn;t show any signs of firing. Any ideas please
