cruising speed cut out

Well, prevoius posts have brang me this far, but i could still use a few pointers. A while back, i had codes read(SES light). they said i had camshaft position wrong. i read posts, took info to heart and changed plugs. Well it got rid of low speed(0-45) cut out(SES light still on), but after that(45-75), chug,chug,chug. it gets better when i slow back down .
Could my problem more with fuel say filter or possibly pump. appreciate simplified (mechanically challenged) feedback

If your still getting a cam position sensor failure code. It should be plugs, cables, or the coil pack. It could be bad grounds, corroded terminals, to arcing cables