Stevens91gt

when i start up my car the rpms go up to like 1400 and drop, usually to 500 or so and goes back up to around 750
but the last month, a lot of the time the rpms just drop until the car dies, i just went to get dinner and was trying to
start my car for about 15 god damn minutes, everytime it was the same, so i just held the gas and kept the rpms
to 1000 and held the brake and reversed, and i put it in drive and it was fine

any help is much appreciated, thank you

Twister

what mods are done?
is this your 91 GT that is having issues?
what is the weather conditions?
when was the last tune-up?
is your sister cute?

Stevens91gt

lol
mods: CAI, UD pulleys, BBK shorty headers, TrickFlow upp & low intake man., full exhaust w/ cats, 70mmTB and EGR, new plugs, wires
weather:70-85*, so cal baby!!
last tune up? idk, my brother said u cant get them done to my car..(im 16 so idk if thats rite or not)
and yes it is my 91 gt

Twister

ok, what are the plugs gapped at? are the plug wires on tight? check to see if the mass air meter is covered in oil

your brother does not know crap, a tune-up on an EFI car is new plugs, wires, rotor, cap, PCV, check the timing and swap the fuel filter...

Stevens91gt

idk wut they are gapped at, i got bosch platinum 2's
yes the wires are on tite
where is the mass air meter?

well i meant gettin a tune up in a shop
and we changed the fuel filter, he put
the timing back at stock

Twister

ok, ditch the platinum plugs, go back to copper ones, the stock electronics work best on copper plugs, set the gap according to the info on the hood sticker. The mass air meter is the item that both parts of the Cold Air Induction kit went around. The reason why I ask is that if you over oil the filter in the CAI, it can cover the meter and give false air measurements.

Is your sister over 18?

Stevens91gt

ok, so new plugs
oo ok i thought that was it, but wasnt sure about the mass air meter
and my sister is 14

RawGtPower

check your TPS. it should read .98 to .99 volts. If its off then your car will idle high for a while then die. Thats what my stang did

Stevens91gt

TPS?
..sorry im new to cars

Twister

throttle positon sensor, it is the electronic thing that screws to the top of your throttle body, you need to check the reading with a multi reader