i have an LS in my 95 hatch. i got the car a few months ago and it just started this problem. after running the car for a little while, it starts a rough idle. if i try to drive it, it runs like crap in low rpm but opens up fine. if i come to a red light while it is having a fit, it will idle down so much that i will have to give it throttle so it wont shut off. i have replaced the idle air control valve and that didnt help any. i unplugged the tps and reset the ecu and it didnt do anything. i took someones suggestion and bled the coolant system and that didnt do anything.
DOES ANYONE HAVE A SUGGESTION THAT MIGHT HELP ME? I WOULD APPRECIATE YOUR HELP. THANKS.

 

Clean your MAP sensor
Calibrate your TPS
Check timing and fuel pressure at idle

 

how do i calibrate the TPS?

 

-Get a volt meter, digital or analog.
-loosen screws that attach TPS to TB. (you may need to take a dremel and make a slot in each screw for a flathead, because USDM TB's have breakaway bolts instead of torque spit bolts)
-turn key to ignition.
-attach voltmeter to middle PIN on the harness and slowly rotate the TPS until the desired voltage is reached. (in this case, between 0.45-0.50 volts)
-tighten down screws finger tight and test for correct voltage at 0 throttle and at WOT (WOT = 4.45 or higher).
-if voltage is correct, tighten down screws, but not too tight or you will crack your TPS.

 

thanks for the help. i will do that first thing tomorrow. my car was running like crap tonight while we were out cruising so im anxious to get it running right. im in the process of buying all my parts needed for the ls vtec conversion, so thats another reason why i need to get it running right. thanks man......