i've got a 95 maxima gle with the twin cam 3000 v6. it started running rough like it was missing about 3 or 4 days ago and 2 days ago the engine light came on, flashing at first and then it stayed on. i thought it was the plugs, so i've changed those and gapped them to .011, as it says in the chiltons book i have. but that has not fixed the problem

Take it to a mechanic and have the codes scanned. Also, check out maxima.org for more detailed info.

definately take it to a shop and let them run engine diagnostics so they will find out exactly what it is