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Originally Posted by GMMerlin
With a rough idle and a SES light with lean codes and random misfires, I would start leaning towards a vacum leak around the intake.
Changing fuel won't fix that problem.
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Thanks for the advice. I also have my doubts about a "fuel quality 'fix' ". Right out of highschool I worked at a garage. My boss used to detect intake manifold leaks by filling an oil squirt can w/gasoline & would squirt it around the manifold until the engine smoothed out. Is there a safer way to detect this type of leak today? A vacume guage?