Engine trouble, Dies at idle Options

[trojanhorsepower]

All,
I have been enjoying my car but have a recurring issue.
Starts great
Runs fine for maybe 20 min
Starts to once in a while act like it turned off for just a 1/2 sec then comes back on - causing the car to lurch and the shifter to jump
After about 30 or 40 min the car dies if stopped and allowed to idle. It just drops off spools down to nothing,
It restarts if you hold the gas peddle all the way down. Sometime when it restarts it is weak, then it goes fine.
As long as the car is in gear and moving it does not die.
It will continue to do this until I get home. If I am coordinated enough I can shift into neutral, work the brake with my left foot and keep the RPMs up a bit with my left and it seems fine (no stumbling or trying to die at higher RPMs) but if I come to a light, stop and let it idle it will just idle down to nothing.
Sometimes when I get home it will idle fine until I turn it off. Other times it just dies.


Seems to pull great all through the range
Always restarts

Any ideas where to start?

Thanks

Peter

[emerygt350]

Just cap the tb port.

Good news on the mps. Did it leak at all?

Now I guess you are stuck with the mismatch issue.

With the retard disconnected you should try running it again real quick just to see if anything changes.

Next step should be checking the vacuum at idle when this happens. You can just attach your might vac to the line that goes from the plenum to the decel valve.


Sadly, there is not much to do but get that mismatch figured out. You could pop the other ECU on there just to see if It improves. @Pbanders might know how to identify the different models. One last thing you could try is leaning the idle on your current setup with the ECU pot. Not really a fix though.