1976 Other Dodge Models

If the backfire was a one time thing don't worry about it. Bu tif it's not idliilng correctly then check the low cylinder. It may be just a bad plug or wire. But when doing compression checks there shoul be no more than a 20% variance which your one cylilnder is or borderline at best. You could have something like a bent pushrod as well. Check the plugs, and ignition stuff first to see if that corrects it. Then take the valve cover off and look for bent push rods or things not working right, broken spring etc. Then after all that put some oil in the cylinder and test it wet to see what it does. If it doesn't change then it's agood possibility it's an internal problem.