carb problem
You didn't say if you have A/C. If so cap the vac line at the TEE leaving the back of the center carb. I have had the vac. lines under the dash for the A/C to crack and leak.
I just had a similar problem with my tri power. It ran fine until after I had driven it a while and then I stopped at a light and the car would idle down to a point where it wanted to cut off. It took me awhile to track the problem down but it turned out the the front butterflies did not close tight and was allowing extra air into the manifold.
The reason it was hard to find was that the only time it would stick was when I put the peddle down and caused the front and rear carb to kicked in. While parked I had to rev up the engine to the point that the front and back carbs. kicked in and noticed when I let the throttle go back to normal is how I found that the throttle body butterflies were not all the way closed. Seemed like once the carbs got hot there was some seizing in the shaft of the trottle body.
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