1999 Solara, Surging/Bucking issue

[zranen]

Hey everyone,

I have a 1999 Solara SLE V6, and for the past few thousand kilometers the car has had an issue with bucking/surging. The car will preform the issue under medium acceleration, low and hard no issues. Also at 60 km the car will surge to such an extent that the tachometer will show the up surge. Further, when at 80, 90, 100, and 110 the car will feel as though its being tugged gently.
Current codes are PO441 and PO446.
The car also has a heavy exhaust smell coming through the passenger side window when open, but shows no signs of exhaust leakage.
Plugs, wires, ignitions coils and O2 sensors have all been replaced.

Any help would be great

[1gse]

http://www.toyotanation.com/forum/t140285.html