Y2ksi

00 SI, JRSC, bolt ons, B&M FPR, JR FMU, etc..

What's happening is, if it's a warm day out and I am coming up to a stop and push the clutch in the car will drop down to about 500rpms for a sec or two then die. It will start right back up and idle just fine until I give it some gas then it does the same thing. It doesn't do it all the time but most of the time it does. It started towards the end of last summer and then it didn't do it at all over the winter and now that it's warm out it's doing it again.

I have cleaned the IACV, checked the idle and the cars idles around 500rpms normally. Replaced spark plugs, dist cap and rotor, plug wires, fuel filter, FPR etc.. and nothing is helping. One thing I just thought of is that I am running a magnaflow race muffler for a cat without the o2 sensor plugged in, it just strapped up under the car and the weird thing is, is that it doesn't or hasn't thrown a CEL for it.. It used to but then it just stopped.. Could this cause the problem? I wouldn't think so since it's just there to make sure the primary is doing it's job but who knows.

Any ideas is greatly appreciated !