D-jet troubleshooting, Only one item left on my list! Options

[saigon71]

My 1974 2.0 D-jet is running very strong, but there were two lingering issues with the FI that I wanted to address over the winter:

1. A severe idle "hunt." The engine would rush up to about 1200 RPM, then nearly stall...repeat cycle.

2. Every once in a while the car would buck, most notably at highway speeds...it wasn't bad, just annoying.

Last week I installed a new circuit board in the TPS purchased from Dave Sprinkle a few years back. It was calibrated according to the Pelican tech article using an ohmmeter.

I took a 210 mile road trip over the weekend to test things out. The car now idles perfectly through the entire warm-up sequence. Thanks Dave! (IMG:style_emoticons/default/beerchug.gif)

The problem is that I still have the same bucking issue. All my research points to the TPS. Any suggestions on what to check next?

[r_towle]

Yup, one is advance, one is retard.
Retard was left up capped and floating in the atmosphere on stock cars.

Also I think some parts swapping was going on because in order for it to work properly, you would need a throttle body that has one vacuum port in front of and one port behind the throttle plate.

Not every car has the right throttle body and not every distributor has both ports for retard and advance.

Mixed results in the car I tuned that had everything required.
It would slam back to idle between shifts....