Replaced dither valves and tmap, cleared the codes and we're all good.

352 and 353 indicate MAP sensor issues,damaged wiring component failure ect, however 771 is FTV valves (or dither valves) or attached vacuum hose problems. Possible plugged orifice on side of mixer.
Make sure all vacuum hoses are leak free, confirm the PCV valve (very critical) and spark plugs are new.
Resolving 771 fault may eliminate other faults.