The '95 855T has been running great since the fuel pump replacement back in May. Last week I had a CEL, pulled the following codes just now.

2-3-2 lean idle ( I hear an air leak around the tree when cold)
5-4-3 misfire on one or more cylinders
4-5-1 misfire on cylinder 1
4-5-3 " " " 3
4-5-4 " " " 4
4-5-5 " " " 5

The 2-3-2 seems pretty common but I've never had the others in 10 years of ownership. The car runs roughly for the first few minutes (hear the hiss) then smooths out as the temp needle starts to climb. (hiss also subsides)

I'm going to check the obvious; elbows, lines, etc. Then the coil connections. The plugs, wires cap and rotor were replaced about 10,000 miles ago. I'll likely r/r them too.

Any other ideas?

Erwin