crank up the truck in o/d light comes on then it will ill up for a min

Been reading blogs that suggest withering harness. Others mention they have changed both the battery and altenator and had no resolution.

Nothing comes on when start car has its own panel for a/c and it's out won't work what is causing this to happen

The engine is still running. What could problem be.

Car cranks but tries to stall when accelerating or pulling a hill

Engine try's to stall when I accelerate or going up hill

dealership stated that my catalytic converter on the left was stopping up or clogging up....but yet I had no warning other than the flapping noise, the car never lost power or check engine light never came on...any thoughts????