Engine Rpm Drop!!!!!!!!!!!

[maze]

I have noticed that around 4500rpm the engine will drop rpm and the go back up within a second or so and will keep doing that until I let off the accelerator this is either drivind and or in park, no accesories were on. I noticed thisa after I had to remove EGR valve for cleaning due to real bad idle ( found egr stuck open by carbon and cleaned, idle is ok now). I let engine come up to normal temp and then tried to see if it would hesitate at any rpm, that is when I noticed this issue. Any help would be appreciated. Thanks....

[michtom]

Sounds like you are holding down the accelerater and the fuel cut off is kicking in. This is normal, this is put there to protect the engine.

[maze]

I forgot to add that this is a 95 model 3.8 series II. I removed ful filter last night and it does not seem clogged, I do not remember this fuel cut off engaging ever before. was that option available back in 1995.

Thanks.

[DarkShadow]

Originally Posted by maze

I forgot to add that this is a 95 model 3.8 series II. I removed ful filter last night and it does not seem clogged, I do not remember this fuel cut off engaging ever before. was that option available back in 1995.

Thanks.

fuel cutoff has been standard on gms for years, its there to protect the engines rpms from going into the red zone and overrevving....but 4500rpms is kinda low for the fuel cutoff to kick on, are you experiencing this in drive or park/neutral?