iwas goin down a bad brick road about 35. at the end was a verybumpy section. i slowed and stopped atat the stop sign and my car felt funny. i looked at my tach to see the rpms dropping to almost 0 and the car was shaking and my battery light popped on for a split second. ive driven 40 miles with no further problem did i wiggle a wire loose on the bumps? or should i look at my alternator or something else?