Car doesn't idle too smooth and running pretty rich. Also after revving it rpm's kinda drop like it wants to die sometimes. That my O2 sensor that's bad??
more than likely vac leak especially if you hear a hissing sound. Pretty good indication. Check all the hoses that run underneith for the aux air valve, IAC valve and of course all vac lines.
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1992 Nissan Sentra SE-R - Fully Built SR20VE, BWS400SX Billet 67mm and much more
JMS Racing tuned to 716whp, 423wtq at 29psi
10.5 @ 149.2mph to date I believe the fastest trap speed SE-R, Much more to come with some changes!