JH,

Thanks much for a very through and thoughtful response to the question. I appreciate the references. There's certainly enough responsibility to go around, but we still seem to hear of CO poisoning incidents far too often.

The audience may be interested to know that there are relatively inexpensive (<$300) aftermarket upfits for older lifts that add an O2 sensor in the exhaust and effectively make the pre-2002 engines 'closed loop'. This will keep them closer to stoichiometric air/fuel mixtures and in tune longer.

Thanks again.

WHM