RPM's sky high and climb upward after start

[sman83]

I just changed out the push rods and rocker arms this morning, got every thing back together and I go to start it and the RPM's just started climbing and climbing until I turned it off.

I unhooked the battery and tried again, same thing. I checked every thing and it all looked good. I just put new lifters into it last week and drove it for a week no problems but now the RPM's are high and are at about 4k in about 10 5 seconds after starting.

Its a 99 Mountaineer 5.0...My first thought was something with the throttle cable but the cable and plate are where they are supposed to be, granted I havent got out to see whats going on after I start it.

 

[sman83]

Would unhooking the throttle cable and cruise control cable then starting it to see if thats in issue advisable?

 

[BubbaFL]

Sounds like a major vacuum leak. I'd start by double checking all of the intake manifold plumbing (brake booster, pcv system, etc.)

 

[sman83]

Got it, the cruise control cable was stuck in the bracket somehow. All fixed now