hmm weird. - Alfa Romeo Forum
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hmm weird.

a few times now, i have tried that after a long drive, my alfa rpm goes from 950 rpm down to
500 rpm then up to 950 rpm again.It revs slowly
up and down, and it won't response the speeder??
it just sounds like a carborator hopeless out
of adjustment. (booaarhhh) and suddently it's
normal again?????. i have changed plugs,lambda,water temp sensor, air intake sensor,fuel filter and no luck. and it still lose
power some times.
help help i am about to get alfa tired...
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a very dirty car

It sounds like it could be a mis-fire with the engine running on 3 cylinders for a short time. Does the slow revving also mean the engine is very rough?
I would suspect a HT (plug) lead, a coil on the way out, or maybe even an injector.
Next time it happens, check the plugs to see if one is blacker or a different colour than the rest. You would be amazed what you can diagnose from the colur of a plug.
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Could be a long shot, but when was the last time you looked in the plug holes. These tend to fill with water, on a few occasions i've totally cleaned them out put the leads back in thinking no water would pass and then the next time i look water is in the bottom again. I can only think of condensation but worth a look.

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yes the engine runs rough. It feels like it
have lost 50 hp. But there is no warning light
on. then i can turn off engine, and then start it again, and it's back to normal.?
i have have noticed that one of the leads is
a little damaged. there is missing a little rubber
in the end.
I don't thrust the local dealer, because once i
had my fiat punto gt plug in, and he said that
almost all my sensors and my computer was wasted.
It costed about 1000 dkk ( 100£) for 5 min work.
there was no wasted sensors or computer. It was
the main plug for the computer there needed a cleaning. (It could still drive)

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hmm , weird

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