3.0L been running fine for 8 mo., after driving 20 mi. car stutters and stalls while driving. cranks for 30-40 sec. and starts. idles ok , placed in gear and stalls. starts runs 20-30 sec. and stumbles and stalls.
How many miles on car? Maintenance history? Fuel filter changed? Fuel pressure would be very helpful to observe. Checked for spark or fuel while cranking?
Any check engine light on? Check for free at auto parts store.