I did a sreach and came up with a few answers so I am going to start a new thread.

I have a 77f150 2wd with a rebuilt 300 in it with a c4 rebuilt tranny. I did do a few mods, I installed a offy intake and headmen headers and put in a new 4 barrel ed carb. I also installed dual exhaust with 40 series flow masters. I want to know what rpm should I be at while idling? I just installed a tach yesterday and I'm at 1100 at idle. I know that's Pretty high, before I go play with my carb I wanna know what it should be at.

Thanks for the help.

 

Around 650 rpm would be a good starting point.

 

Thanks, I will play with the carb tomorrow after work and get around 650.

 

650 is where I have both of mine and they idle nicely.

 

Note that his truck is automatic, so if @ 650 in gear, it will be higher in neutral or park.

 

Ah, good point. I've never set the idle on an auto before.

 

so if you have an i6 stock manual where should it be at , 650, mines at 1000

 

1000's a little high. 650 is the stock setting for a manual.

 

should i just adjust idle screw

 

I'd start with that. Back the idle adjust screw out a little bit and see if the RPMs drop. If they don't, it might be an indication of a different issue. Sticking choke, or even a vacuum leak.

 

i backed the screw out but nothing happens, then i see this round thing ( don't know what to call it) that seems to keep the idle up. how to i adjust that, its plugged in to some cable