How test/inspect 2.0L DJet throttle body before swapping it in? Options

[Tdskip]

Hi - the '75 DJet car has a stumble that happens at a couple points in the rev range and at certain RPMs when the throttle is held constant. It rarely happens when the throttle is being exercised up/down the RPM range (like accelerating through turns etc).

I'm thinking worn throttle body "fingers" or the trace pad they travel against (yeah, wrong terms I know) but I believe this could also (maybe) be a sticky advance weight in the distributor.

Any why to test the spare throttle body so I don't swap out the wrong thing?

OR

Should I just pull and open the plastic cover on the one I have to see what is up? Doesn't look that hard to remove it.

What say you gentlemen, and please do liberally apply terminology dope slaps.

Thanks!

[Jett]

We had the same symptoms with our 73 2.0 stumbling at 2700 - 2900 RPM when not accelerating, and it was a worn distributor shaft, that was rebuilt using two other units.

On our 75 2.0 we had the TPS rebuilt with new board but failed within a month, and with the ignition on (motor not started) we could count the TPS clicks and was missing four in the middle, which also caused the car to miss and buck. Found an NOS unit and sent my right arm for payment (IMG:style_emoticons/default/smile.gif)