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2500-rpm miss

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Hello, everyone.
I'm new to this group and find it overwhelming in a helpful sort of way.
Any rate, I have an '86 8v, which is in excellent shape and fine fettle =
apart from one nagging problem: 'round about 2500 rpm, a slight miss =
develops.  This only is noticable when decelerating, or driving at =
constant throttle at that rev range.  The car bucks slightly, and it's =
quite annoying. =20
To try to cure the problem, I went out and boxloads of new Bosch stuff: =
plugs, wires, cap, rotor, coil (thinking it's an ignition fault), even =
the control module (not the Motronic box, but the chip mounted on the =
heatsink next to it).  Installed all this stuff, still she misses.
Then I went and got the fuel system stuff: injectors, injector seals, =
fuel filter, and a main pump.  they went in nicely, but still...
So, I am running out of parts to replace.  I also put in new vacuum =
hoses throughout (the car is getting newer as it ages!) but to no avail.
Anyone had this problem?  I mean, the miss?  Could it perhaps be a =
plugged cat?  I have no experience as to how that affects the Scirocco, =
but maybe one of you might know a thing or two.
This is rather embarrassing, as, being an engineer, I ought to have =
figured this out by now.  The Bentley manual hasn't been much help, =
either.
Again, the car is a California-spec '86 8v with stock motor systems.

Danke,
Dave

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<DIV><FONT color=3D#000000 size=3D2>Hello, everyone.</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2>I'm new to this group and find it =
overwhelming=20
in a helpful sort of way.</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2>Any rate, I have an '86 8v, which is =
in=20
excellent shape and fine fettle apart from one nagging problem: 'round =
about=20
2500 rpm, a slight miss develops.&nbsp; This only is noticable when=20
decelerating, or driving at constant throttle at that rev range.&nbsp; =
The car=20
bucks slightly, and it's quite annoying.&nbsp; </FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2>To try to cure the problem, I went =
out and=20
boxloads of new Bosch stuff: plugs, wires, cap, rotor, coil (thinking =
it's an=20
ignition fault), even the control module (not the Motronic box, but the =
chip=20
mounted on the heatsink next to it).&nbsp; Installed all this stuff, =
still she=20
misses.</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2>Then I went and got the fuel system =
stuff:=20
injectors, injector seals, fuel filter, and a main pump.&nbsp; they went =
in=20
nicely, but still...</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2>So, I am running out of parts to =
replace.&nbsp;=20
I also put in new vacuum hoses throughout (the car is getting newer as =
it ages!)=20
but to no avail.</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2>Anyone had this problem?&nbsp; I =
mean, the=20
miss?&nbsp; Could it perhaps be a plugged cat?&nbsp; I have no =
experience as to=20
how that affects the Scirocco, but maybe one of you might know a thing =
or=20
two.</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2>This is rather embarrassing, as, =
being an=20
engineer, I ought to have figured this out by now.&nbsp; The Bentley =
manual=20
hasn't been much help, either.</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2>Again, the car is a California-spec =
'86 8v with=20
stock motor systems.</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT color=3D#000000 size=3D2>Danke,</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2>Dave</FONT></DIV></BODY></HTML>

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