Engine Exhaust System problems of the 2004 GMC Sierra

At the above listed date my vehicle began blowing excessive blue smoke through the exhaust. I discovered at that time there had been a recall on the fuel injectors several years before. I attempted to remedy this with gm at that time and was told I was too late past the date to get service on the recall. I was not notified of a recall and would have taken care of it at that time. It continues to blow excessive smoke but only at idle. I wish to have the problem corrected as it is hurting the environment. I was given a price at the local dealership to repair this issue. I don't feel I should have to pay to have it corrected as there was a recall on the problem.

2004 GMC Sierra 6 liter v8 - exhaust manifold bolts broken off - $600 to repair. Design and/or part defect. Dealer said this happens. Recall or have gm correct?.