Car stalling AGAIN, Updates- none of them good. Options

[rjames]

Drove around for 30 minutes in 80+ degree weather. All arterial roads, so several stop lights, etc. No problems until I was almost home. Car stalled when I stopped at a light. RPMs just dropped to zero. Was able to start it again with a little difficulty and had to keep my foot on the gas to keep it from stalling out again. Power seemed ok though the rest of the way home (I think). It stalled once again at a stop light a couple of blocks from home and then again when I pulled in the driveway. I let it sit for 30 seconds, started it again and it idled just fine. Rock solid at 1000 RPMs. Pulled it into the garage where it sits now.

Prior to today the car has been running and idling perfectly since I went through the FI parts last year, which included installing a 123 distributor, new CHT sensor, a newly rebuilt mps (calibrated for correct afr on my engine), new vacuum hoses, NOS throttle body, rebuilt injectors, new fuel pump, valve adjustment and timing.

I haven’t checked the AFR since last year, not sure why it would change though.
It’s a ‘75 so the fuel pump is in the front, so I can rule out vapor lock I think.

Anyone have ideas as to why it would be stalling?

[914_teener]

My quess is a kinked fuel line underneath the rack cover.

Check your fuel pressure.

Second best quess is there is vacumm leak. Sure you have the ported vacuum line to the 123 set up right?

[rjames]

My quess is a kinked fuel line underneath the rack cover.

Check your fuel pressure.

Second best quess is there is vacumm leak. Sure you have the ported vacuum line to the 123 set up right?

Yes- Djet 2.0, 123 distributor.

Doubt a fuel linked itself after several months of not being kinked. (IMG:style_emoticons/default/confused24.gif)
Vacuum leak would cause high idle.

I’m starting to wonder if my new (to me) MPS went bad with a torn diaphragm.... will check to see if it holds vacuum and report back.

[Mark Henry]

Vacuum leak would cause high idle.

Small leak or worn TB bushings yes, but not if it's a large leak. A large leak would act like the OP's issue.

Are the vacuum hose to plenum in the correct spot? Not the same but when I had my 2.0 with SDS EFI (stock djet intake) I connected the vacuum line into the wrong port and it wouldn't idle worth a crap. I swapped the hose to IIRC the correct djet MPS port and it solved the issue.