Chevrolet Silverado Oil Fill Cap

When I Open My Oil Cap It Has A Strong Suction On It While Engine Is Running And Is Very Hard To Open. Why Is This?????

I Have A 1998 Chevy 1500 350 V8 5.7l Vortec That Leaks Oil In The Front I Have Narrowed It Down To The Timing Cover Or Intake And I Suspect...

I Drove My Truck With The Oil Cap Off On The Freeway For About 200 Miles. Oil Split Out, But There Was Still About 2-3 Quarts Left In It...

I Was Driving My Truck And It Started Slowing Down And When I Pushed On The Gas It Would Not Accelerate. I Pulled Over And Was I Was Pulling...