So this just started happening today. Out of the blue, usually on a deceleration coming to a stop my RPMs dwindle and the motor shuts off. Runs good otherwise. Cleaned Mass Airflow Sensor, planning on replacing O2 sensors (wish they were cheaper). Can anyone point me in the right direction..
Thanks

To add some info - 1994. 3.9. 109000mi. Head redone in last 8000.

 

By-pass Air Valve, remove and clean. When's the last time you did a timing check or check for vacuum leaks at the intake mounting bolts and all vacuum hoses? The box under the passenger seat has codes on it, red LED, check it.

 

I will check bypass air valve. I wrote this post a friend's house. When I headed home the truck was trying to shut off while driving. Crankshaft positioning sensor? Everything on top redone/checked in last 8k when heads we redone.
I'll check for vacuum leaks too.

 

The 94/95's (NAS) did not have crank sensors or cam sensors. The RPM is read from the ignition coil and that might be worth a look, coil connections/condition.