My 85 Alfa 90 V6 tends to idle quite roughly especially when cold but even when warmed up it's still rough and tacho reads only about 600-800 rpm
On the road it's quite smooth so only at idle do I Gert that roughness.
Any ideas?
Nick
I had this happen to my other 164 a while back. Found out it was a perished vacuum hose running off the plenum (intake manifold) letting in air the maf didn't read.
I would check all vacuum lines first of all.
Andrew.
Agree with that, definitely an air-leak somewhere. The "accordion" hose from the filter to the plenum is notorious for leaking. Seal it up with shoo-goo or something similar