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88 F150 302 running rich
I have an 88 f150 with a 302. I have replaced plugs, wires, fuel filter, air filter, throttle position sensor, oxygen sensor, installed dual exhaust and got rid of converters, distributor etc. I get bad gas milage around 10 mpg. The truck runs great when it is cold, just like it is suppose to but once the motor warms up it starts to bog down and not have as much power almost like it is getting too much fuel. I know it runs rich because after installing my new exhaust it was no time before the pipes were black and you can smell how rich it is. I have been told it might be the engine coolant temp sensor but i don't want to replace it on a guess. Any help would be great. Thanks
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