1999 2.0 none diesel Jetta,faltering and cutting out as I drive?

Hi Iam a newbee, and I just got this nice older Jetta recently and it is starting to cut out on me when I drive it. It starts up again from the momentum in gear,then repeats the faltering. Usually it is better after it warms up a lot. Check engine light code is p0102, p 1476,and p1127, It got worse after I cleaned the air filter. The mass air meter is newish and clean looking. Would appreciate any possible solutions,including where to get a free or cheap shhop manual to download.