Engine Turning too many RPM's

[armygrunt03]

I have a 2002 4wd QX4 and recently had it serviced at a local shop due to the SES light being on as well as a drive ability issue that developed. This problem is not noticeable until around 50 mph, and gets progressively more noticeable as speed increases. At first I thought that the overdrive was not engaging but after doing a little troubleshooting discovered it was not transmission related. To put it in perspective at around 60 mph the engine is turning right at 2k rpm, at 70 it's turning 2500 rpm. The codes that it is throwing is p1140, 1167, and 1058. Now the mechanic said after he pulled the o2 sensor and checked it with an ohm meter and cleaned it off that it was no longer throwing the 1167, or 0158 I will however confirm this when I take it to the local vatozone and have them scan it for me. Which if what they say confirms what the mechanic is telling me I am left with the infamous 1140 DTC. My question is this, would this code affect the engine in the way I am describing? I understand that this is an intake timing solenoid, but would it affect the engine to the degree I am describing? As soon as I take it to the Autozone and get the codes read again I will update this post. Thanks for the help.

[SixGuns]

Couldn't tell you about the codes....my R50 has yet to throw a single one. But I can tell you that RPM's at cruising speed just suck. At 80, you're running damn near 3k...73-ish runs 2700...So, welcome to the world of Pathfinder ****ty gas mileage. You should be pushing somewhere around 16mpg all-around. If only we had 5 speed automatics....this 4 speed nonsense sucks.

[Buzzman]

Those RPM numbers look pretty normal to me.My Pathy turns about 2,500 at 115 Kms/hr, (about equivalent to 70MPH).The gas mileage number (16) is pretty well right on too.That's the way it is.Good thing gas prices have dropped in half since the summer.FYI: It was 62 cents/litre this week, compared to$1.40 6 months ago. Cheapest in over 5 years.