I posted this question before, but maybe I can be more specific and hopefully get some advice on how to fix this frustrating problem. I have a 91 lx w/120k. It is all stock except k&n filter, flowmaster mufflers, timing raised to 14 and ford racing wires. I drive only in city traffic, w/most trips only being 2 miles or less. I have been getting 10-11MPG and I'm driving it like a grandma. I've checked the air filter and had the car diagnostic tested, and nothing came up. I double checked all of the spark plug gaps and everything seems up to spec. If it helps, there are also two minor additional problems: when the car is warm and at idle, it lopes about 100rpm and there is an occasional quiet "backfire"/"pop" coming from the driver side tail pipe--only at idle. Someone mentioned something about O2 sensors as a possible remedy. Any help would be fantastic, as I'm starting to get frustrated and broke.
Thanks
Mike
Thanks
Mike