Ok, took some measurements. The car seems to run @ 195F most of the time, even when it's baking hot outside. So it's not a heat issue.
What i noticed, it starts stumbling when hot under load / in drive when standing at the lights... It's seems to be getting worse. I don't believe it's a fuel issue ,because it feels as if it starts losing ignition, until it dies. It fires right up no problem, in park idles fine, but once in geat it dies again.
I'll start with the bascis:
* spark plugs
* spark plug wires
* check the distributor cap
* it does have Mopar electronic ignition (
Proform Distributor/Ignition Control Module Kit 66993; Mag Trigger for B Mopar | eBay)
So i was also thinking maybe something with the vacuum advance, or the electronic module is faulty ?
Anything else you might recommend i check ?
Like i said the problem occurs when engine is properly warmed up to operating temp, stop at the lights and it takes about 30 seconds for it to start stumbling, and another 30 seconds and it quits running...