sticking tbi

[GMCTed]

i need some help figuring out my problem. in the past few weeks the throttle on my 1987 suburban has gotten harder to push down on to accelerate. i have to tap pretty hard to get it to move, i automatically thought the problem was the throttle cable, i put a new one in and there was no change. i used carb cleaner and a brush to clean all around the tbi thinking that maybe the springs had a buildup of dirt and gunk making it sticky. still no change.  the pedal is not the problem either. when i manually work the linkage i can feel some resistance and i figure thats where the problem is. my question is if anyone has had a similar problem? i was thinking that maybe the shaft that the butterfly is mounted to is the problem, as far as i know it`s the original tbi. maybe it`s just worn out after 20 years.

if i need a new tbi unit should i get a holley unit? i`ve seen them on ebay going for about the same as a stock one. the engine is stock except for dual exhaust tbi spacer, and a chip.  any help will be greatly appreciated. my right foot is killing me  lol.

[VileZambonie]

All you need to do is lube the TBI with some good penetrating oil. Carb clean will only make it worse

[GMCTed]

i forgot to mention that i tried penetrating oil first. then i used carb cleaner, then oiled it again with no improvement.

i did more searching online and found that the butterfly shaft can wear in the tbi body causing this problem. that has to be my problem.

[VileZambonie]

use a good penetrating oil and spray the throttle shaft on the outside of the unit and on the inside. keep working it in. If it doesn't help replace the bushings or disassemble, clean and lube the shaft with Moly Lube