I just drove frrom Las Vegas to Breckenridge Co. at about 10,000 ft. When I arrived I noticed a hesitation at start up and at light acceleration I feel surging and light bucking. I was here in June and didnt notice anything like this.

 

did you change anything on the turbo

 

No, other then a Quadzillla box it is completly stock.

 

when was the last time you replaced the fuel filter or drained the fuel/water separator?

 

I changed all filters befor Ileft on Thursday so less than 1000 miles. Ran great till I got here. My first thought was bad fuel so filled up with no change I have a new filter but havn't had time to change it.

 

jaycoje.

I live at an altitude of 7K ft. I have experienced a little rough idle when the barometric pressure is low. I had a Quad box for a while, but I experienced a little surging/bucking now an then after I installed the Quad, so I took it off and those things disapeared. Altitude presents some very different real-time operating circumstances for vehicles to overcome, throw in something that alters what your computer sees and you get results you don't want. I figured that since the Quad box always had the boost fooling regardless of whether it was turned on or not, maybe boost fooling was at the root of things. I can tell you that all those operational symptoms disapeared when I removed the Quad.

You could have gotten bad fuel, may need a filter change again.

CD

 

we add a fuel pressure gauge to show when to change filter and if we have a problem like this it helps on diagnostics, get a taped banjo bolt and two gaskets pn bf-tapped and bf 3963983 and a mrg-1561 gauge from genosgarage.com do not pay any attention to the test gauge only statement use a oil pressure gauge kit from auto zone or others for $7 it has 6' of line and all fittings the kit is available in copper or plastic, the copper is noisier than the plastic just stretch it out and lay it in the middle of a piece of duct tape fold over and trim off the excess if you have a vacuum pump it may be easer to put the banjo bolt on the bottom of the filter rather than the cp3 i can't remember on 04. the lp pressure will be 4 to 10 lbs, i also think the quad box is the culprit

 

Thanks everybody, pulled the Quad box and everything seems fine now. I never thought that could be the probelem its been on for so long I forget about it. Thanks again.