Slant 6 dies when driving

TF360 said

It hesitates and eventually will die, but will start right up and continue to hesitate. If it cools it will run smooth again for a while then if going from light to light the hesitation will begin again. It's a 74 with California emissions. Almost seems like a vacuum leak, but I don't see any broken lines.

Click to expand...

Vacuum leak can be inside a component too. The 74 had all sorts of emissions crap on it. More so for C.A.P. Some things didn't receive vacuum until the engine warms. EGR valve and spark advance for examples. Back in the day just pinching hoses with needle nose pliers would pin point the culprit. Today that might crack rotten hoses too. Good luck with it.