car is bucking under acceleration...any ideas? Options

[era vulgaris]

My car has developed an extremely annoying bucking under acceleration. It started about a week ago, and at first it would only happen while accelerating out of a fast turn. But now it does it all the time while accelerating. It's like the car is oscillating between half power and full power, making it lurch-slow-lurch-slow-lurch-slow. It's like you're riding a bucking bronco or something. The only cure seems to be to get off the throttle completely, upshift, then slowly accelerate.

Anyone have any idea where I should start looking first?

[era vulgaris]

Got a friend bringing over his fuel pressure gauge later this week. I've driven through two tanks of gas with the new filter, and the bucking has gone away completely when accelerating in a straight line whether or not the engine is cold or warm, and whether or not I accelerate hard or slowly.

The bucking has also gone away under hard cornering only if I complete the downshift prior to starting the turn and maintain 3K+ revs through the turn. But if I shift during or after cornering hard, the bucking happens while trying to accelerate away from the turn. I can power through the bucking by putting the pedal to the floor, however that's not always possible with traffic.

I'll see what my pressure readings are. But for some reason the G forces of cornering while momentarily in neutral are causing the issue.