check engine light gives me a code of po742,expensive job to do? 120,miles on on 2000 Pontiac Montana

It does do the bucking around as I am driving, everytime I drive. nothing major with the van other than this,need some good insight on this

Asked by for the 2000 Pontiac Montana
try ethanol treatment in fuel system. ethanol build up could be effecting fuel delivery. 1 tank premium with treatment. result will take drive time to show. review when last tuned. may need to pull spark plugs and regap or replace(rec. premium). examine ignition cables. these are things u can do your self. if prob. persist than take to a mechanic.
Thanks will check all that you mentioned Thanks, Lorena