Sierra-odd happening

I own a 94 GMC Sierra 305 4X4 AT. I've had the truck for several years and
have had no problems. I noticed a slight lope when I pilled in the driveway
yesterday, I revved it up to see if it would clear it up. I did something
that I've never done before, I put the pedal to the floor and held it there.
The engine was going for maximum rpm and then it just backed off, them
started building rpms and backed off again. It happened as long as I held
the pedal down. It acted as it was almost timed, so many rpms and it drops
back to so many rpms and then starts to build up again. I can't duplicate
the situation on the road. Is there a sensor or some kind of control in the
ECU that prevents dummies from over revving the engine while out of gear or
do I have some other problem?
Thanks..

Yers pcm has a fuel cut at about 4k, just as you figured.
"memrez" <nevermind.RemoveThis@no.net> wrote in message
news:mEdSg.5696$e66.500@newssvr13.news.prodigy.com...
>I own a 94 GMC Sierra 305 4X4 AT. I've had the truck for several years and
>have had no problems. I noticed a slight lope when I pilled in the driveway
>yesterday, I revved it up to see if it would clear it up. I did something
>that I've never done before, I put the pedal to the floor and held it
>there. The engine was going for maximum rpm and then it just backed off,
>them started building rpms and backed off again. It happened as long as I
>held the pedal down. It acted as it was almost timed, so many rpms and it
>drops back to so many rpms and then starts to build up again. I can't
>duplicate the situation on the road. Is there a sensor or some kind of
>control in the ECU that prevents dummies from over revving the engine while
>out of gear or do I have some other problem?
> Thanks..
>



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