Rough/Stall in traffic

1992 Olds 88 @54K. Starts fine, runs fine on hwy speeds. Under normal operating temperature and in stop and go heavy traffic, engine loses all power until it finally stalls. Starts up right away with same symptom. Let it cool for a 10-15 min's and it runs great, as long as not in stop and go traffic.

If accelerate in Park I once in a while get a "snap" as the rpms come back down.

Changed plugs and wires, no check engine light or codes, tested coils and ignition module- are all ok. Fuel pressue is 38 lbs.

The mechanics told me they think it is a locked torque converter, and to take it to a tranny shop. The tranny shop told me it is def not tranny and probably the crank sensor. But I am not getting codes.:banghead:

Is there anyone in the NY/NJ area that can diagnose this properly without replacing half the car blindly?
Does anyone have a clue as to what the problem could be?

Welcome to AF. If you could scan it or check for spark/injector pulse when this happens you could determine either the crank sensor number one or the icm number 2, both these would give similar symptoms. No codes for these, but a no cranking rpm on the scanner or no spark, points to these components.

WOuldn't I have trouble starting it if it were a crank sensor?

Crank sensors are kinda wierd...they can start showing symtoms like yours before they quit functioning altoghter.

What about your vacuum hoses--are they brittle? Has the PCV valve been replaced lately? Has the fuel filter been replaced lately (they only last 12k miles)? I think 38 psi is a tad bit low.