Revs Go Up And Down

[jtur32]

has anyone started there gtr and with the same throttle position the revs go up and down after its had a good run{shouldnt let the misses try to drive it}

[unarmed_skyline]

i got an na and i've had it happen a few times on cold mornings when i idle it fluctuates from 1000-1500 but its happened i think 4 or 5 times in 7 months, i think it might have to do with the engine trying to warm up but could be the idle control??

[B0oStEr]

It could be faulty afm/s.

Our gtst idled up and down, sometimes stalling after a run until we pulled the top off the afm and resoldered the pins to the pcb.

We also found the solder that holds the metal shield under the lid had broken and the loose shield may have shorted out some components.

Next time it's playing up give the afm plugs a wriggle and see if it changes anything.

[itbmils]

MY GTR started to hunt @ idle (when warm) after doing an engine rebuild with quite a few mods (new adj cam gears, exhaust, port and polish)

retune of the PFC fixed the problem

[shif_tea]

I had similar problem, cleaned out dirty AFM and got my 100K service done and that fixed the problem