T350 sticking throttle bodies

[TerryB2]

Started my T350 the other day after a prolonged 6 month layup - for reasons I won’t go into here. She is on a trickle charger and started first time as usual, however when tickling the throttle to keep the revs around 1200 for a few seconds as she was a bit lumpy revs started to rise much higher, this was with my foot removed from the throttle, when they reached 2k + without any help from me I switched the ignition off. Suspecting a sticking / frayed cable I removed the pedal box cover but no frayed cable, the cable was stuck with the pedal moving freely along the cable. Seems the cable wasn’t returning. So removed air box, removed clevis pin and cable separated cable from throttle bodies and cable moves freely, nice smooth action and returns OK. Have lubricated cable and it is working smooth and free. However trying to move the throttle pot linkage is extreme stiff as though they are sticking and tight. When I open the butterfly valves they stay open as if stuck.
I would expect them to spring closed quite freely, or are they dampened by the front and rear TPS modules? What should I expect.?
Have I just got gummed up throttle pots that need cleaning or is there an underlying issue . Have sprayed some WD40 on the linkages and they move a bit easier, but don’t spring closed, and intend to clean the throttle bodies with some carb cleaner, over the next few days. anyone on here had this issue and can offer any advise.

Thanks

[TerryB2]

Thanks for the replies,

1/ The throttle cable has been disconected. There is no resistance in the cable it all runs nice and amooth, i have as a matter of course lubricated the cable anyway.

2/ As far as i am aware the TBs are all original and unmodified, I am thinking like yo mk1fan that they have rusted slightly and as you say and why they are sticking, In cannot see any other reason.. I will check the TBs are all firmly fixed but nothing seems loose. She was running fine the last time I used her, throttle action was smooth she just went away into the garage as normal.
I have spreayed WD40 onto all the spindles and between the linkages and the TBS and will cleani the TBs , butterflies and spindles with some carb cleaner. The spindles have eased off a bit, maybe i just need to take some time to let them soak in and ease off..

I will let you know.

Many thanks

[TerryB2]

Thanks rfisher I will have a go.

BTW I did try and search for a similar problem but all I could find were posts relating to throttle cable issues.

[TerryB2]

Many thanks

[TerryB2]

So have been liberally applying WD40 throughout the past few days to the TB linkages and I now have free moving linkages mechanism that spring back nicely from being fully open. Hurrah 😃 Many thanks for everyone’s help and advice.

[TerryB2]

at least.....

[TerryB2]

TwinKam, dont worry already done I'm not having this problem again, and ill check regularly, mind you its the first time in over 5 years of ownership!