I have a 7fgu30 sn 69096, with a 4y and ecs, hard to start when cold, after cranking for 30-40 sec will catch for a couple of seconds and die. cleaned the throttle body and checked fuel cut off solenoid, (works normally) eventually it will catch and run, but with a rolling idle for several minutes, once running will accellerate normally and sounds fine. No codes displayed and engine lamp works normally. Any help would be appreciated. thanks