Hey all, I searched best I can but I'm stumped on this issue with my 88 lxi 5spd.
After the car is warmed up and I pull up to a stop the idle will drop as low as 400-450, this is accompanied by vibration (though I'm hesitant to blame the motor mounts as they were replaced roughly a year before I bought the car). My car is also running very rich with my exhaust smelling like straight spilled gasoline, not sure if this is normal. One last detail, sometimes as the idle drops it is sometimes accompanied by a bump that seems to be in time with one of the cylinders. When I say bump I don't mean a knock, just like when you suck something solid through a straw and it *pops* through.
I've put some Fuel system cleaner on my last fill up and have started using 89 octane gasoline, it seems to help but I feel like its just a band aid.
Any pointers would be appreciated, my old 3g lude did something like this and I never quite figured it out. I'll also add that there is no loss of power and anyone who says you can't scoot around with a 4cylinder sohc engine is full of sh*t, she feels fine when in motion ;>