have you tried to adjust your timing?
your car will need to idle higher than stock so you may need to adjust your idle screw.
is your TPS set to around .95 volts?
are all of you vaccum hoses connected... connected to the right ports?
have you tried adjusting your fuel pressure any higher or lower while the car is running?
are your plug wires connected to to the right plugs?
these are a few variables that are worth looking into.
i had the exact same problem when i first started my engine after adding my heads, cam, etc. car used to idle at about 700rpm (stock) now it's boosted up to 900rpm. i also had to adj. my fuel press high (currently running 19lbers but will add the 24lbers soon), and adjust my TPS (throttle position sensor) down to .95 after doing these things, my car no longer dies and idles just fine.
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1989 Red Mustang 5.0 LX Hatchback
ENGINE AND DRIVETRAIN:
Explorer Upper and Lower Intake, C & L 76mm Mass Air Meter, Aeromotive AFPR, 24lb Injectors, 155lph Fuel Pump, FRPP 65mm Throttle Body, Edelbrock 6037's, Crane Hardened Stock Length Pushrods, FRPP 1.6 Rockers, E303 Cam, FRPP Timing Chain, GDI 3-Row Radiator, BBK Shorty Headers, Pacesetter Off Road H-Pipe, Borla Pro-XS Stainless Mufflers, FRPP 3.55 Gears, KYB GR-2 Shocks and Struts, FRPP C Springs, 180* Thermostat, AOD to T5 Swap, B and M Ripper Shifter, FRPP Cobra Clutch, Summit Racing Adjustable Clutch Cable and Quadrant, FRPP Alum. Driveshaft, Race Systems Custom Burned Chip, Maier Racing 3" Cowl Hood, 17 x 9 Cobra R's, 245-45-17 (front), 275-40-17 (rear)
TRACK TIMES: 14.485 @ 96.134 MPH (WHEN I HAD AN INTAKE, GEARS, AND AOD ONLY... HAVEN'T BEEN TO THE TRACK WITH MY CURRENT MODS BUT WILL POST TIMES AS SOON AS I DO)
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