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.

[pbanders]

A lot of times I don't respond to these requests, not because there's anything wrong with the question, it's just that given what's posted, I don't know enough to answer. We've talked about this before, but when you have problems like this, you have to go through a generalized checkout before you can say where the problem is coming from.

I learned this when I lived in Sunnyvale from my mechanic, Bob Grigsby. He told me that when a customer came in with a problem and a theory about what was causing it, he would write down what the problem was and listen attentively to the owner's theory, then pretty much completely ignore it. He then had a multi-step procedure he went through on every car that probably took him only an hour or so.

I'm guessing here as to what he'd do: He'd check the egine mechanical condition (compression), if it ran, he'd check the manifold vacuum. If it was noisy, he'd check the valve clearance. Check for intake and exhaust obstruction. Check the charging system and battery. Check the ignition system. Check fuel pressure and delivery. Etc., etc. Perform basic carburetor or fuel injection system tests.

Once he was done with this procedure, if the problem was still present, then he'd do more detailed testing on the systems he thought were most likely the cause. But, he told me that in at least 90% of the cases, the problem was gone.

We've talked about it a lot, there needs to be a sticky here with a set of procedures for the basic "doesn't run right" problem. It would be better to direct people there than to continuously post the same procedure, or different procedures, or just guess.

[kwfast]

Thank you for the great information. Will let you know how it turns out.