yak600

did engine swap on 03 636. put 04 motor in w/2k miles. took throttle bodies loose and moved them to the top of the frame. got motor in with everything connected. when i first started it the idle seemed to jump around a bit. would go high for a few seconds then back down low then up and low. took it for a ride.if you were at 3 grand steady for awhile all of a second it would start accelerating on its own. i would back off the throttle but if you held it it would come bak down.it didnt do this before. no kinks in fuel line or vent hose. i would think you wouldnt have to sync throttle bodies since i never messed with anything. opinions please?

kandyberetta

make sure you didnt forget to plug in some sensors sounds like the ecm is tryin to find the correct air fuel mixture check the throttle postion sensor and all ur emmissions parts

yak600

thanks. i found it. was a small vaccuum hose about 1/2" long that goes into a T. if your looking straight down you can't really see it because its under a connector or sensor in front of and about the middle of the throttle bodies.everythings good for now.