Well I finally procharged my truck and dyno tuned it last week..

But now, when in park it will start to idle up and down until its bad enough, that it will turn off...

Anybody any ideas what it could be??

 

Sounds like a tune issue.

 

You mean like this??? Mine did it from time to time, figures it didn't so it bad here.. That was some time ago, since I have changed to a bigger blower, it does not do it as much.. It is in the fuel trims.. Not sure exactly why it has stopped but has... Very very very rarely does it do it now( of course I still need a way fine tune)

 

I see you are from florida. Who tuned it?

 

Did your BOV close when that happened?

 

I had the RPMs going up and down all the time before but didn't turn off, when I switch Tuner the problem went away, get back with your Tuner to correct it.

 

Nope, the bypass valve only closes under boost, not vacuum.. I completely blocked it off so that it couldn't vent, the problem still was there. Like I said now it does not do it anymore, the tune has never been touched...

 

Jeremy from fasterproms tuned it..but there were problems and he wasnt able to fine tune it after it came off the dyno

 

I would take it back to Jeremy

 

yea just like this...except mine doesnt go up as high...would yours ever drop so low it would shut off..