ApocalypseHoboken

Hi everyone, I just bought an 87' GT and I have a small issue here that I'm definitely not in the know about. This is my first Fox Body and I have an issue with the idle with it. The car starts fine, idles at 1000 rpm, drives fine, returns to idle at 1000 rpm. Then after 5 to 10 minutes of driving (or after the car really warms up) the car wants to idle at a complete stop at 1500 RPM. I notice this when I come to stop lights. If I get on it when it's doing this the car just seems to lack power. Here is a pic of my air intake setup.

http://i15.photobucket.com/albums/a3...a/DSCN2155.jpg

I am new to this whole 5.0 Ford thing, but from what I can gather so far, some years have a mass airflow sensor and mine doesn't. Do I need to have a MAF sensor in order to be using the air intake that I have on the car? Is this why the car is idling high?

5pointslow91

if u dont have a mass air meter and urs is an older 1, then you have the air density meter, i have the mass air meter cause mines a 91 so i dont know that much about ur setup with the density meter

AdderMk2

your car is probably still speed density.... you shoudl check all your vac lines... it sounds like you have a computer controlled vac leak

something is leaking, and itll only cause your vac leak at a certain condition

ApocalypseHoboken

Thanks! I will definitely look into that. I was thinking maybe it was because the guy I bought it from put that air intake on it and the motor wasn't accounting for the extra air or something...

Also I have 2 more quick questions....

My car is pretty much stock with the exception of bigger front brakes, the air intake, and a cam. (nothing crazy though) My future plans include keeping the car naturally aspirated but possibly doing some upgrades as time goes on. Maybe convert to mass air over time and then headers from there... However, at the time being I am going to rid of the stock rear end and am debating on what gear to get. I am perfectly happy with a car that can run mid to low 14's in a 1/4 seeing how I mostly just cruise mine. Knowing that I never plan on taking the car over 300 horse is 3:73 a good gear to get? I have 3:73 gears in my Ranger and the top end sucks and I just don't want my Mustang to not have any top end at all because I occasionally do some highway driving.

Finally... fuel pump... if I get an aftermarket one what reccomendations do you have for my setup and would I have to also buy an adjustable pressure regulator as well? I just want to see if these are parts that I should be repacing at the same time... I don't want to get too high flow of a pump but then have the stock regulator if it can't handle the new pump.

Again, I'm new to this so any answers that point me in the right direction are appreciated!

LTnone

Buy a 255lph pump and a regulator. That way, if you ever change your mind and want to mod more, you won't have to buy another one.

w8less

i would probably get 4.10's with your idea of mods for the future are to stay n/a