Overhaulin'

1986 chevy custom classic k20 5.7 L 2wd double pumper Idling second opinion?

So I just would like a second opinion I believe I know what it is and was going to go work on it but it's raining something fowl outside so for curiosity I'd like to get an opinion other than my own or my gf''s which really just means only my own, woman and cars ha! no there's a lot of knowledgeable woman out there in automotives anyway!! so i went to mve some stuff for a buddy yesterday and when I started the truck in park gear it stays at a really high idle like so high i was afraid to keep it in park but when i put it in drive the idle drops down still high tho just not where it should be.So i was going to go out today and adjust the idling screws I figure thats all it is right just tweak with it now should i tweak it when its in that high idle then risk when i put it in drive where it was considerablely lower have it poop out on me or should I have the lady hold down the brake in drive and bring it down from there then put it in park and see how it sounds? thanks for the info I love car talks!

Public Comments

1. I would check to be sure the throttle stop screw is not on the fast idle cam!
2. Hi, If you have the carb then your fast Idle cam can be the plastic one that gets chewed up and sticks. The screw for it is behind the choke housing and hard to see, you have to look from the front of the engine to see it. Back it off a slight 1/4 turn and get your choke checked. The screw is hard to get at without the correct tool so be aware of that. The screw gets stuck on the cam steps that are now worn and chewed and creating new steps, so you can get a rebuilt if you prefer, might be expensive though, or you can repair that one.