3500 idle revs after exhaust change

#1
Changed my exhaust manifold after it cracked and replaced it..now my 2.5 L Jeep is revving 3500 at start up and won't come down.. What is the problem?
 
#3
Vac line maybe. Mine did that after I lost the evap canister and some guy at a junkyard in Waterloo stuck a screw in the vac line and fixed it
 

WolfGT

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#4
Mine would do that when my tps was messed up. It was even a new one. I guess I just picked up a bad one because replacing it fixed the issue.
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