I know i have asked this question before but i didnt get alot of info. I have a 92 RS 305 TBI. After I start my car it revs up to 1500 rpm and it dies. It usually tries to stay alive, sometimes it does and sometimes it dont. It didnt use to do it that much, only when I turned up my beats while my car was off. Recently I got all MSD cap & rotor, blaster coil, 8.5 superconductor wires. Also I put on March power & amp underive pulleys. I have been runing it hard lately and also had my beats on. Now everytime I start it, it wants to die. Anyone know why its doing this or had this happen to them. Give me some input! Thanks

 

My guess is that the under drive on the altenator is killing the motor, especially when your "beats" are on, you may have killed the altenator just as well, check to see which alternator you have.

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1987 Firebird Formula
305 LG-4
GM Vortec heads 2.02x1.6 valves
Crane CompuCam 2030
700-R4 Trans
4 barrel quadrajunk remained by holley (this carb stinks!!!)
edelbrock performer intake
Hypertech Thermomaster Chip
Open Element Air Filter
No Cat with Straight pipe (Dynomax muffler rusted apart and fell off probably could not stand the heat )
Accel H/P Coil

- Soon to be installed
383 stroker (built and ready)
NO MORE COMPUTER CRAP
700R4 Lockup kit
Edelbrock TES
True Dual exhaust or 4 inch single pipe to dual 2 1/4"
Stall convertor

 

A bad alternator wouldn't give you the symptoms you mentioned, but you could get it tested to make sure its good. Make sure you have a good battery to start with. If it revs for a few seconds and then dies then check your fuel pressure.

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92 Camaro RS, LO3, 5-spd, T-tops

Performance:
K&N Open Air Filter, Edelbrock performer TBI intake, Fastchip Prom, Timing +4 degrees, Centerforce clutch, Xact 8mm wires, SLP 1 3/4" Headers (coated), Flowmaster Catback Exhaust, Z28 Grille w/aftmkt fog lamps, MacEwen white-face guages
Electronics:
Alpine 8030 Alarm System, Valentine One Radar Detector (How did I ever drive without one?), Pioneer DEH 7450 Head Unit w/6-pack CD changer, Pioneer DEQ 7600 Sound Processor, 2 Kenwood KAC-846 Amps powering 2 12" Pro Red subs, 2 Pioneer 6x9 and 2 MTX 4x6 speakers.
NEXT UP: TBI mods, 3.42 gears w/Torsen posi

 

Well I changed my fuel filter today. (Knew that was not the prob but it needed to be changed.) Could of made some diff. Well i adjusted the idle up to 1000rpm in park and its been runing good ever since. I dont see any prob with the idle being 1000rpm in park. Anybody know something i dont know about that?
Thanks

 

Throttle Position Sensor??