Sorry to take so long to post. I haven't been watching the group lately. The problem seemed to be highest when it was cold outside. This occured in December and we had a cold snap. I went through the same testing everyone else did. The vehicle was difficult to drive but managable until I replaced the air bypass valve. I was 2 hours from home and struggled to make it back. Stopped at the Auto parts store and in the parking lot toss in a new set of plugs and fuel filter. I was taking pot shots! Made it home and said screw it. Took it to the dealer since I felt it was the upper intake gasket and I did not have the desire to swap it when it was -10f outside. The dealer tested and confirmed it was the gasket. It was deteriated pretty bad. I believe the reason why the problem got worst after the air bypass valve swap was the fact that I layed across the upper intake. I weigh 200lbs and I think it was just enough to move the gasket or open a larger hole to cause the vehicle to run worse(larger vacuum leak). In case any one was thinking I should have swapped out the air bypass valve again when it got worse, I did. That's why I thought the upper intake.
