2004 Venture hesitating and jerking

If you floor it on acelleratuion dioes it seem to have normal power?

The solenoids are inside the transmission.
You may need a book and some special tools to make the repairs.

Time for a rebuild

Trans is gone

Had neighbor look at this same problem. Turned out the shifter cable linkage near the top of transmission had popped off. They popped it back on and works but a bushing in the clip probably needs replaced. The neighbor rewched over engined top between firewall and engine and popped it back on.
Works fine but does needs a clip/bushing part and auto parts store has to get from Chevy

AAMCO free estaments coast to coast

distributor is advanced

Probably due for a trans service--which is flushing the trans and replacing the trans fluid and filter.

get it into the shop (transmission shop - not the dealer) ASAP!   We just had one of the clutches go in ours - it burnt through the tranny fluid in less then a month.  This with 125k (kilometres) on the odometer...

it's on the passenger side fuse panel - 2nd or 3rd row over - 20A mini-fuse.  There is a label on the panel cover.

Bring to tranny shop or repair shop, have it scanned for trouble codes, many electrical parts and solonoids in those trannys, possible it may just be a shift solonoid bad or needs adjustment, much cheaper than replacing tranny. good luck!