[DinFtown]

I know I'm running a completely different set up.... 2.7CIS, but I had the same problem right at 2K rpm on decel I would get a real bad jerking. I had a crack in a rubber boot that was sucking air in after the TB. It was making the car run way lean on decel. It would cause light backfire, idle hunt, and the jerking. I know I running CIS, a completely different system, but just check to make sure you have no air leaks. The CIS is very picky because it is unable to monitor the burned/unberned fuel so it is unable to make corrections. Any air leak, even little can cause a poor running setup. Your O2 sensor will monitor your fuel to air ratio by the unburned/burned oxygen in your exhaust and computer should correct the fuel output for the air leak, but it will not go to far off it's fuel map in relation to your TPsensor or else with a air leak you car would never idle down. Just use a can of starting fluid at idle, and spray around you intake manifold if you find a area that causes the idle to pick up, then you are sucking air in the intake in that area. That is a cheap, and easy way to check. A shop can do a smoke test for you, that makes it easy to see right where the leak is. A few gaskets later and your golden.
Good luck