engine runs ....then it doesn't...then it does..., is this a D-Jet or an Ignition problem ? Options

[kwfast]

I have a relatively stock '75 2.0 FI minus the emissions stuff. Car has worked fine. Just did 750 mile round trip to Okteenerfest. Haven't changed anything since.
Now, car starts up same as always and runs fine for about 10 minutes. Once things are starting to get warmed up, the engine starts to hesitate getting quickly worse until it loses power and dies. Engine then turns over fine but does not fire / start. Wait about 10 minutes, car starts right up and drives fine again....until is get warmer and it hesitates then dies again.

What components would cause a problem like this ? and
How would I go about testing them to verify.

thanks,

Ken.

[BeatNavy]

I hate to immediately go to my favorite usual suspect, but....failing CHT? Normally when it's totally failed you may not be able to get the car to start or it will stall very soon after starting and then not start again until the engine cools. Failure, failing, or intermittent failure can be caused by a bad sensor or an open or poor connection between sensor and ECU. Anytime there's an open, nearly open, or sometimes open circuit between the sensor and the ECU you're going to get an overly rich mixture that will cause a warm or hot engine to die. Check the connections, the sensor, and the whole wire on the harness back to ECU.

More info at this link: http://members.rennlist.com/pbanders/djetp...tm#troubleshoot

Scroll down in the table on that page to read about the Cylinder Head Temperature sensor troubleshooting.

Also -- totally unrelated -- verify dwell and that your timing didn't change for some reason and get way too retarded.

If both of those check out, on to something else...