98 Dakota with 2.5 and manual tranny showing 0121 code

code says voltage dif between tsp and map. I have changed the tps. Check engine light gone, but still have infrequent cruising stumble/power loss. Should I change the map?

yes change both,, also check the connectors, for corrosion,
or broken /bare grounding,

You might find you have a leak in the little map line.
On a v8 it's a little rubber elbow piece if memory serves correct that comes out of the bottom of the map and goes to a nippple on the TB. Sometimes people move this to the manifold with a crappy hose and this causes problems too.

Dont know what it is on the 4 cyl but might be similar.
If there is a leak in that, it could cause a problem like you describe.

Thanks guys for your help I'll try both.