'91 5.2 stumbles

I have a '91 Dakota 5.2 with 118k miles. Compression is 140-145 on all cylinders. Computer, all sensors, timing chain, plugs, wires, caps, starter and battery are all new. When the timing is set at 10 degrees BTDC as specified, it hesitates, stutters, and backfires when accelerating. Advancing the timing 6 or 8 degrees improves things considerably. Any ideas on what might cause this? Thanks for any help.

Anybody? Please?

i have a 91 dakota SE 5.2 4x4 had problem a few years ago with rough idle as if was gonna stall and had rough acceleration. replaced fuel pump , plugs and wires , bought new EGR valve and when i went to replace EGR valve the gasket was broke , replaced gasket problem solved. Now i have a new spare EGR valve , spare used fuel pump. lol hope this helps