After swapping my headers to 1 5/8 shorties from the stock headers,I ended up with a broken flange (bad weld)which will be fixed tomorrow.I drove the car today a little with the leak,and the engine seems a little shakey.The engine is an '86 5.0.Stock except for the Explorer intake.Would the leak cause that?Could it be giving the O2 sensor a crazy reading,thus causing the shake?I didn't do anything except change the headers.Nothing else.The geader size 91 5/8) from stack wouldn't cause that would it?Thanks.