My car would loose power when shifted from 3rd to 4th gear. Then I stopped to put air in tires n when I gave it gas to go I went about 300 yards n when I pushed in the clutch it stopped like I put the brake on & it wouldn't move when I tried all it would do is kill the engine when I eased out on the clutch. What causes this problem? Could it be that my emergency brake is causing this or my brakes locked up?