Thursday Morning Riddle

I’m a slam dunk in basketball; fruit in a jar;
I’m a misfiring gun; improvise on guitar;
Not allowing a signal to get very far;
And I’m bumper to bumper for car after car.

Who am I?

UPDATE: Riddle solved by Bronx Richie. See comments for answer.

2 Responses to “Thursday Morning Riddle”

  1. Bronx Richie Says:

    jam

  2. Bill Says:

    JAM is correct. Way to go, Bronx Richie!

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