The National Highway Traffic Safety Administration (NHTSA) is directing the recall of 11,974 2001-model-year heavy duty pickups built by General Motors to fix faulty crankshaft position sensors, under NHTSA campaign ID number 07V521000.

Only Chevrolet Silverado 2500/3500 and GMC Sierra 2500/3500 trucks with 8.1-liter Vortec V8 big block gasoline engines are impacted by the recall.

According to NHTSA's website, the crankshaft position sensor can operate intermittently or fail completely. If the sensor operates intermittently, the service engine light may illuminate and cause the vehicle to run rough or stall the engine. The engine can be restarted immediately or after a cool down period. If the sensor fails completely, the engine will not run.

GM dealers will replace the crankshaft positioning sensor free of charge when the recall begins in December.

Taken from an article in pickup truck.com  

I have a 2001 8.1 chevy silverado HD and I am having problems but I have never received a recall; I am afraid to drive on the freeway with this problem(so far I havbe been in the right lane, god forbid I am in the passing lane when it quits.  Please help me   thank-you JIm