ok so my 88 rs has a 305 v8 and is carb'd. my problem is if i start the car after its been sitting it will start fine, and then i revv the engine. if i stop revving the engine and try to let the car idle it will die out, what am i looking at here plzzzz help

 

i have an 86 ta that's carb'd and it does the same thing. I also notice that once the car is warmed up it idles at 1500 which is way to high. anyone know how to lower the idle, i couldn't find the air mixture screw?

 

19transam, your carb is idling at correct rpm when cold.

lukeylouk, are you sure you have a carb - what numbers are on the side of the carb?

have yu both done a tune up or whats going on?

 

Mine did the same thing. It was a vaccum leak from one of my brake lines. Fixed it and I rarely have this problem anymore. Maybe once a month she'll act up, but for the most part, everything is fine.

 

Not from the factory you don't. No carbs after 1987.

Most likely you have TBI, "Throttle Body Injection" - an electronic fuel injection system.

 

well true but the 305 is a rebuilt v8 from way earlier so yes it is carb'd
i see the carborator, and the guy who sold it to me showd me where he disconttected the fuel injection and conntected the carb because the engine needed less fuel pressure or something and the fuel injector was to much. maybe sounds correct? i donno but i kno it is carb'd

 

It should have a fuel pressure regulator in the supply line with a return to the factory return line. If it doesn't, it wasn't done properly and you'll be burning out your in-tank electric fuel pump, or flooding the carb. You can't just "disconnect" something and have it work properly.

Assuming it is a carb (a picture with the air cleaner removed would be very helpful here), is the choke wired for 12 volts when the engine is running?

My spidey senses are tingling that this, if indeed a carb, is an Edelbrock.

 

yeah i don't know if my car ever had a tune up, i know it sat for maybe 2 years before i bought it but it idles great when its cold, i don't get it?

 

k ill get some pics and get some more info for u guys all i know now it isnt even turning over maybe battery problem? didnt rlly get to take much look at it as it was midnight after a shift and i just didnt want to deal with it, more pics l8er! after work...

 

how did you find the problem in the vaccum and how did you fix it. because now my car has a very low brake pedal and i bleed all 4 lines already but the pedal still grabs low, sometimes not at all.

 

you should be able to hear a vacuum leak,but an easy way to find one is to use carb cleaner.Spray it around the base of the carb and the air horn(top of the carb) and see if your idle changes.I have the stock Quadracrap on mine and when I picked it up it has a rough idle and I just had to replace a couple gaskets. What kind of carb is on it?