My 91 Camaro w the 350 tpi started running rough the other day. About 1 week ago. When it starts cold it runs fine, but as soon as she heats up a bit it starts runnning rough like it's missing, or running rich. It doesn't want to idle very well. It will accelerate fine, but at low rpm, it seems likes it missing. I put the timming light on it and the timming was set at about 24 degrees advanced. I moved the timming all the way back to 6, but she ran like crap, so I set it at 12 degrees advanced. I've replaced everything I can think of: plugs, wires, cap, rotor, o2 sensor, egr valve, knock sensor, and fuel pressure regulator diaphram. I still can't get the thing to run right. Someone please help me out. Thanks
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