I have a 2005 Ford F-150. It has 86,500 miles. I just had a full tune up, new plugs, gas filter, etc. Several times within the last week, while driving less than 45 mph, the engine
started to shudder, the whole truck would shake, the check engine light would flash, and it sounded like it was being starved for gas. This only happens in the morning when the engine is cold, once warmed up it is ok. When this happens, I would give it more gas but no change, at any speed. It would speed up, but shake and shudder more.. I would then pull over, put it in neutral, let it idle for a few minutes, while revving it now and then, and then after a few minutes, it would go away, and be normal the rest of the day. The check engine light would then go off. Any ideas on this ?