I had my share of idle problems and almost invariably the trouble was a
vacuum leak or an idle controller(in front of the right tail light)
problem. A rough running engine can be tamed as a temporary repair often by
disconecting either the o2 sensor or the idle stabilizer valve. It's only a
temporary measure though. You need those items to work to get best
performance.

On Feb 22, 2017 18:13, "Dan N" <dn92610@gmail.com> wrote:

thanks all for the help... the problem is solved... here's the finding

I check thoroughly for air leak but found none.. so I took the throttle
body out and give it a 2nd cleaning including removing the big screw.. then
I install a new gasket (on the plenum).. and voilà... the idle is back as
it should now...

dan