I recently moved to Denver (from Dallas) and am experiencing loss of power when my rpms fall below 2 on my '91 5.0L 302. Prior to the move, I had: flowtech headers installed, flowmaster exhaust, minor tune-up (belts, plugs, wire, filters), and of course the oil changed. I reset the computer by disconnecting battery cables, but that didn't help. Any thoughts as to what the problem may be and a solution?
Going from Flat-Land to Denver will do that to a vehicle. Indeed, the air is thinner at higher elevations. Your computer should then adjust your fuel injection accordingly. You'll probably find that your fuel economy is much better while your power is down (since your burning less gas). I'm from Michigan and I've been out to Colorado twice now. I can't believe the power loss, but it's due to the thin air. Likewise, I'm very surprised by the increase in fuel economy. It all makes sense, though. You're burning less fuel and getting less power and there's not much you can do about it. At least you're saving a little on gas.